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Hand Boiler

Intriguing toy/ token. Glass tubing contains a special volatile liquid that boils at just above room temperature - the warmth of your hand will make it boil! (It's a mercury compound so toxic and corrosive when released - DON'T break the glass or spill the liquid). You cup the bottom bulb and in a few seconds the liquid boils up through the tubes; cup the top bulb and it boils back down again - defying gravity ! ? (Not really - it's now a gas under pressure). This science toy had a lifetime as a "love meter" - you demonstrate the warmth of your love. Comes in several colours. Very light box, 16cm tall. Tubing is glass, so fragile. View details to see image.