{"product_id":"hand-boiler-en-verre-liquide-bleu-qui-bout-dans-la-main-caloris","title":"Glass Franklin's boiling point, blue liquid that boils in your hand — HEAT","description":"\u003cstyle\u003e\n.aa{font-family:Georgia,'Times New Roman',serif;color:#1A1A1A;line-height:1.7;font-size:15px;max-width:760px;margin:0 auto}\n.aa p{margin:0 0 1rem}\n.aa a{color:#185FA5;text-decoration:underline}\n.aa .aa-title{display:inline-block;border-bottom:2px solid #FAC775;padding-bottom:4px;font-size:16px;font-weight:600;margin:1.75rem 0 .5rem;letter-spacing:.3px;color:#1A1A1A}\n.aa .aa-badge{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:3px 10px;border-radius:20px;margin:0 4px 4px 0;vertical-align:middle;font-family:Georgia,serif}\n.aa .aa-badge-or{background:#FAC775;color:#1A1A1A}\n.aa .aa-badge-brun{background:#5C3A1E;color:#FFF9E8}\n.aa .aa-badge-noir{background:#1A1A1A;color:#FAC775}\n.aa 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#ebe5d6;border-radius:6px;padding:.4rem 1rem;margin:1rem 0 1.5rem}\n.aa .aa-sp td{padding:.55rem .4rem;border-bottom:1px solid #ebe5d6;font-size:13px;vertical-align:top}\n.aa .aa-sp tr:last-child td{border-bottom:none}\n.aa .aa-sp td:first-child{font-weight:700;color:#1A1A1A;width:45%}\n.aa .aa-gift{background:linear-gradient(135deg,#FFFDF7,#FFF9E8);border:1px solid #FAC775;border-radius:10px;padding:1.3rem 1.5rem;margin:1.5rem 0}\n.aa .aa-gift h3{color:#5C3A1E;font-size:16px;margin:0 0 .6rem}\n.aa .aa-gift p{font-size:14px}\n.aa .aa-faq{margin:1rem 0 1.5rem}\n.aa details.aa-q{border-bottom:1px solid #ebe5d6;padding:.85rem 0}\n.aa details.aa-q summary{font-size:14px;font-weight:700;list-style:none;padding-right:20px;position:relative;cursor:pointer}\n.aa details.aa-q summary::-webkit-details-marker{display:none}\n.aa details.aa-q summary::after{content:\"+\";position:absolute;right:0;top:0;color:#FAC775;font-size:18px;line-height:1}\n.aa details.aa-q[open] summary::after{content:\"\\2212\"}\n.aa .aa-a{font-size:13px;color:#3a3a3a;margin-top:.5rem}\n.aa .aa-a p{margin:0 0 .5rem}\n@media(max-width:600px){.aa .aa-vars,.aa .aa-ben{grid-template-columns:1fr}}\n.aa-links{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:1rem 0}\n.aa-links a.aa-link{display:block;background:#fff;border:1px solid #ebe5d6;border-left:3px solid #FAC775;border-radius:6px;padding:.8rem 1rem;text-decoration:none;color:#1A1A1A}\n.aa-link .lt{display:block;font-weight:700;font-size:14px}.aa-link .ld{display:block;font-size:12px;color:#555}\n@media(max-width:600px){.aa-links{grid-template-columns:1fr}}\n\u003c\/style\u003e\n\u003cdiv class=\"aa\"\u003e\n\n\u003cp\u003e\u003cspan class=\"aa-badge aa-badge-bleu\"\u003ePhysics experiment\u003c\/span\u003e \u003cspan class=\"aa-badge aa-badge-noir\"\u003eGlass\u003c\/span\u003e Simply take it in your palm for the magic to happen. The \u003cstrong\u003eCALORIS hand boiler\u003c\/strong\u003e, also known as a \u003cstrong\u003eFranklin boiler\u003c\/strong\u003e or \u003cstrong\u003elove thermometer\u003c\/strong\u003e, is a \u003cstrong\u003eglass scientific object\u003c\/strong\u003e 16.5 cm tall that turns the heat from your fingers into a spectacle. Two transparent bulbs, a small one at the top and a larger one at the bottom, are connected by a \u003cstrong\u003edouble-loop tube\u003c\/strong\u003e in which a \u003cstrong\u003eblue liquid\u003c\/strong\u003e circulates. Place your hand on the bottom bulb: the liquid climbs the loop, reaches the top bulb, and starts to bubble, looking as if it is boiling, even though it remains barely lukewarm. Then hold the top bulb and the movement reverses. Behind the effect lies a real lesson in \u003cstrong\u003evapor pressure physics\u003c\/strong\u003e, visible to the naked eye and without any batteries. Fragile and delicate, this \u003cstrong\u003escientific gift\u003c\/strong\u003e, recommended for ages 14 and up, will find its place on a desk, a shelf, or in the cabinet of a curiosity collector.\u003c\/p\u003e\n\n\u003ch3 class=\"aa-title\"\u003eWhy it is so intriguing\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-ben\"\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e✦\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eWorks with your hand\u003c\/span\u003e\u003cspan class=\"ds\"\u003eNo batteries, no power cords: the simple heat of your palm is enough to set the liquid in motion.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e◆\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eA fake boil\u003c\/span\u003e\u003cspan class=\"ds\"\u003eThe liquid appears to boil in the top bulb while remaining at the temperature of your fingers.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e➤\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eDouble glass loop\u003c\/span\u003e\u003cspan class=\"ds\"\u003eThe tube creates two loops between the bulbs: the path of the blue liquid becomes a little spectacle to follow with your eyes.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e★\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eReversible at will\u003c\/span\u003e\u003cspan class=\"ds\"\u003eChange your grip, hold the top bulb, and the liquid moves in the other direction.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e❄\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eA physics lesson\u003c\/span\u003e\u003cspan class=\"ds\"\u003eVapor pressure, heat transfer, equilibrium: perfect for illustrating a lesson or sparking a discussion.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e❖\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eDesktop size\u003c\/span\u003e\u003cspan class=\"ds\"\u003e16.5 cm tall and 5 cm wide: it fits in the hand and slips easily onto a shelf.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eGlass, the material of the experiment\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-mat\"\u003e\n\n\u003ch3\u003eGlass: seeing physics through matter\u003c\/h3\u003e\n\n\u003cp\u003eIf glass is the preferred material for demonstration instruments, it is first and foremost for its \u003cstrong\u003etransparency\u003c\/strong\u003e: it allows you to see every stage of the phenomenon, the rise of the liquid in the tube, its passage through the loops, and finally the arrival of the bubbles in the upper bulb. Nothing is hidden, everything is clear.\u003c\/p\u003e\n\n\u003cp\u003eGlass is also an \u003cstrong\u003eimpermeable and inert\u003c\/strong\u003e material: it keeps the liquid locked in a closed circuit and does not react with it. On the other hand, it remains \u003cstrong\u003efragile\u003c\/strong\u003e. The walls of the bulbs and the double-loop tube should be handled gently, preferably over a soft surface, and stored away from impacts and falls.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eHow the hand boiler works\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-des\"\u003e\n\n\u003cp class=\"t\"\u003eThe heat that moves the liquid\u003c\/p\u003e\n\n\u003cdiv class=\"x\"\u003e\n\n\u003cp\u003eInside the glass, CALORIS contains a \u003cstrong\u003evolatile liquid colored blue\u003c\/strong\u003e. Volatile means that it easily changes from a liquid to a vapor state, even at room temperature. Above the liquid, the empty space is filled with its own vapor, the pressure of which depends directly on the temperature.\u003c\/p\u003e\n\n\u003cp\u003eWhen you close your hand around the bottom bulb, you warm it slightly. The \u003cstrong\u003evapor pressure\u003c\/strong\u003e increases on that side and pushes the liquid upward, through the double-loop tube, to the top bulb. Once the liquid has left the bottom bulb, the vapor itself rushes into the tube and rises in \u003cstrong\u003ebubbles\u003c\/strong\u003e through the liquid: it is this bubbling that creates the illusion of boiling.\u003c\/p\u003e\n\n\u003cp\u003eThe liquid does not heat up like in a pot. It does not boil in the usual sense: it simply moves from the warmer zone to the cooler one. Hold the top bulb, and the \u003cstrong\u003etemperature difference\u003c\/strong\u003e is reversed, as is the path of the liquid.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-steps\"\u003e\n\n\u003ch4\u003eMaking CALORIS boil in four steps\u003c\/h4\u003e\n\n\u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e1\u003c\/span\u003e\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eHold it:\u003c\/strong\u003e gently grasp the hand boiler and close your palm over the large bottom bulb without squeezing the glass.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e2\u003c\/span\u003e\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eWait:\u003c\/strong\u003e keep your hand still for a few moments, long enough for the heat of your fingers to affect the bulb and the blue liquid.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e3\u003c\/span\u003e\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eObserve:\u003c\/strong\u003e the liquid rises into the double-loop tube, reaches the small top bulb, and begins to bubble.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e4\u003c\/span\u003e\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eReverse:\u003c\/strong\u003e let go of the bottom bulb and hold the top one: the liquid slowly returns to the large bulb.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eWhat happens according to your grip\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-cmp\"\u003e\n\n\u003ctable\u003e\n\n\u003cthead\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eSituation\u003c\/th\u003e\n\n\u003cth\u003eWhat you observe\u003c\/th\u003e\n\n\u003cth\u003eWhy\u003c\/th\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/thead\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eHand on bottom bulb\u003c\/td\u003e\n\n\u003ctd\u003eLiquid rises into the loop and bubbles at the top\u003c\/td\u003e\n\n\u003ctd\u003eThe vapor, heated at the bottom, pushes the liquid toward the cooler bulb\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr class=\"hl\"\u003e\n\n\u003ctd\u003eHand on top bulb\u003c\/td\u003e\n\n\u003ctd\u003eThe liquid moves back down to the large bulb\u003c\/td\u003e\n\n\u003ctd\u003eThe hot zone moves to the top: the pressure direction changes\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eObject left at rest\u003c\/td\u003e\n\n\u003ctd\u003eThe liquid gradually gathers at the bottom\u003c\/td\u003e\n\n\u003ctd\u003eWithout a temperature difference, gravity takes over\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr class=\"hl\"\u003e\n\n\u003ctd\u003eCold hands\u003c\/td\u003e\n\n\u003ctd\u003eSlower, or even subtle reaction\u003c\/td\u003e\n\n\u003ctd\u003eThe temperature difference between the hand and the glass is lower\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-info\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e the hand boiler does not measure temperature and does not tell you anything about your feelings, despite its nickname, the \"love thermometer.\" It reacts to the \u003cstrong\u003etemperature difference\u003c\/strong\u003e between your hand and the glass: the warmer the hand is compared to the room, the faster and more spectacular the phenomenon.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-tip\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eTip for a successful demonstration:\u003c\/strong\u003e rub your hands together for a few seconds before holding the bottom bulb, or blow gently on your palms. In a cool room, the effect is often clearer. For a group demonstration, pass the object from hand to hand: everyone gets a slightly different result, which inevitably sparks conversation.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eSpecifications\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-sp\"\u003e\n\n\u003ctable\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eType\u003c\/td\u003e\n\n\u003ctd\u003eHand boiler\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\n\u003ctd\u003eGlass\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eHeight\u003c\/td\u003e\n\n\u003ctd\u003e16.5 cm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eWidth\u003c\/td\u003e\n\n\u003ctd\u003e5 cm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eNumber of bulbs\u003c\/td\u003e\n\n\u003ctd\u003e2 (a small one at the top, a large one at the bottom)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eConnecting tube\u003c\/td\u003e\n\n\u003ctd\u003e2 loops\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eContents\u003c\/td\u003e\n\n\u003ctd\u003eBlue-colored volatile liquid, closed circuit\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eOperation\u003c\/td\u003e\n\n\u003ctd\u003eHeat of the hand, no batteries or power needed\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eRecommended age\u003c\/td\u003e\n\n\u003ctd\u003e14 years and older\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eColors\u003c\/td\u003e\n\n\u003ctd\u003eTransparent glass, blue liquid\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eUse\u003c\/td\u003e\n\n\u003ctd\u003eScientific demonstration and decorative object\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-warn\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eFragile glass object:\u003c\/strong\u003e handle CALORIS with care, without squeezing or shaking it, and place it away from impacts and falls. Never heat it with anything other than your hand (flame, radiator, hot water, direct sunlight) and do not try to open it. In case of breakage, collect the pieces carefully and avoid any skin, eye, or mouth contact with the liquid. Recommended for ages \u003cstrong\u003e14 and up\u003c\/strong\u003e; keep out of reach of young children.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eA scientific gift that gets a reaction\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-gift\"\u003e\n\n\u003ch3\u003eFor the curious of all ages\u003c\/h3\u003e\n\n\u003cp\u003eChristmas, birthdays, a small gift for a colleague passionate about science or a physics teacher: CALORIS is one of those gifts that you try out as soon as you open it and that everyone wants to hold in turn. It appeals just as much to curious teenagers, from age 14, as it does to adults who love desk objects with a story to tell.\u003c\/p\u003e\n\n\u003cp\u003eTo extend the exploration of heat and motion, pair it with the \u003ca href=\"\/products\/moteur-stirling-bicylindre-avec-generateur-et-led-castor\"\u003eCASTOR Stirling engine\u003c\/a\u003e, which also transforms temperature differences into movement, or the \u003ca href=\"\/products\/barometre-a-cristaux-globe-en-verre-storm-glass-aurore\"\u003eAURORE crystal barometer\u003c\/a\u003e. Shipping is free.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-links\"\u003e\n\n\u003ca class=\"aa-link\" href=\"\/collections\/physique-et-mouvement\"\u003e\u003cspan class=\"lt\"\u003ePhysics and motion\u003c\/span\u003e\u003cspan class=\"ld\"\u003eKinetic objects and physics experiments for your desk\u003c\/span\u003e\u003c\/a\u003e \u003ca class=\"aa-link\" href=\"\/products\/moteur-stirling-bicylindre-avec-generateur-et-led-castor\"\u003e\u003cspan class=\"lt\"\u003eCASTOR Stirling engine\u003c\/span\u003e\u003cspan class=\"ld\"\u003eHeat transformed into motion, mechanical version\u003c\/span\u003e\u003c\/a\u003e \u003ca class=\"aa-link\" href=\"\/products\/sablier-a-bulles-en-verre-liquide-colore-8-20-cm-nimbus\"\u003e\u003cspan class=\"lt\"\u003eNIMBUS bubble hourglass\u003c\/span\u003e\u003cspan class=\"ld\"\u003eAnother colorful liquid spectacle under glass\u003c\/span\u003e\u003c\/a\u003e \u003ca class=\"aa-link\" href=\"\/collections\/objets-scientifiques\"\u003e\u003cspan class=\"lt\"\u003eScientific objects\u003c\/span\u003e\u003cspan class=\"ld\"\u003eAll the Lab's curiosities to gift science\u003c\/span\u003e\u003c\/a\u003e\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-faq\"\u003e\n\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eHow does a hand boiler work?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003eThe hand boiler contains a \u003cstrong\u003ecolored volatile liquid\u003c\/strong\u003e, meaning a liquid that easily turns into vapor. This vapor occupies the empty space above the liquid, and its pressure increases with temperature. When you hold the bottom bulb, you warm it up: the \u003cstrong\u003evapor pressure\u003c\/strong\u003e becomes higher there than in the top bulb, pushing the liquid through the double-loop tube. Once the bottom bulb is empty, the vapor rises in turn and passes through the liquid in the form of bubbles. It is this passage of vapor that creates the impression of boiling, without any heat source other than your hand.\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eDoes the liquid actually boil?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003eNot in the way you boil water. The liquid in CALORIS \u003cstrong\u003edoes not become boiling hot\u003c\/strong\u003e: it remains at a temperature close to that of your hand. The bubbles visible in the top bulb are \u003cstrong\u003evapor pushed from the bottom bulb\u003c\/strong\u003e, which rises through the liquid. The result looks exactly like boiling, hence the name hand boiler, but it is actually a displacement caused by a pressure difference. It is precisely this contrast between what we see and what is really happening that makes it an excellent scientific demonstration object.\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eWhy is it called a love thermometer?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003eThis nickname is based on a fun idea: the more \"in love\" or \"warm\" a person is, the faster the liquid rises. In reality, the hand boiler measures neither feelings nor a precise temperature. It only reacts to the \u003cstrong\u003etemperature difference\u003c\/strong\u003e between the hand and the glass. Warm hands in a cool room will produce a faster effect, while cold hands will produce a slower one. It remains a fun game among friends or family, provided you remember that it is \u003cstrong\u003ephysics\u003c\/strong\u003e, not the heart, that makes the blue liquid rise.\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eWhat should I do if the liquid doesn't rise?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003eMost often, it is because the temperature difference between the hand and the glass is too small. Start by \u003cstrong\u003ewarming your hands\u003c\/strong\u003e by rubbing them together, then close your palm over the entire surface of the large bottom bulb and remain still for a few moments. Also, check that the liquid is in the bottom bulb before starting: if it is already at the top, first hold the upper bulb to make it descend. Finally, the effect is clearer in a \u003cstrong\u003ecool room\u003c\/strong\u003e than in a very warm one. Avoid any other heat source than your hand.\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eWhat are the dimensions of CALORIS?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003eCALORIS measures \u003cstrong\u003e16.5 cm tall\u003c\/strong\u003e and \u003cstrong\u003e5 cm wide\u003c\/strong\u003e. This size fits comfortably in the hand, which is essential since your palm triggers the phenomenon. It consists of two glass bulbs, a small one at the top and a larger one at the bottom, connected by a tube that forms two loops. Its size allows you to keep it on a desk, a shelf, or in a cabinet next to other scientific objects. Since it is made of glass, choose a stable location away from impacts, high-traffic areas, and direct sunlight.\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eAt what age can it be gifted?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003eCALORIS is recommended \u003cstrong\u003efor ages 14 and up\u003c\/strong\u003e. It is not a toy: it is a \u003cstrong\u003efragile glass object\u003c\/strong\u003e containing a liquid that should not be handled. It is therefore suitable for curious teenagers and adults capable of handling it with delicacy. For a demonstration in front of younger children, it is best for an adult to hold the object while the children observe. This format makes it a great tool to spark interest in science: one can explain vapor pressure, heat, and phase changes using an experiment that everyone can see with their own eyes.\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eHow do I maintain and store the hand boiler?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003eMaintenance is minimal. Wipe the glass with a \u003cstrong\u003esoft, dry cloth\u003c\/strong\u003e to remove fingerprints. Do not use abrasive products or hot water, and never submerge the object in water. The circuit is closed: you should \u003cstrong\u003enever attempt to open or refill it\u003c\/strong\u003e. Store it on a soft and stable surface, away from heat sources and direct sunlight, and out of reach of young children. For transport, wrap it in thick fabric: the bulbs and the double-loop tube are the parts most sensitive to impact.\u003c\/div\u003e\n\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"Atelier Atypique","offers":[{"title":"Default Title","offer_id":54905645531459,"sku":"AA-CALORIS","price":43.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0231\/3365\/0991\/files\/S719b6beca02d4683b3a3b4e0f1cfce8ak.png?v=1791973062","url":"https:\/\/atelier-atypique.com\/products\/hand-boiler-en-verre-liquide-bleu-qui-bout-dans-la-main-caloris","provider":"Atelier Atypique","version":"1.0","type":"link"}