Be fascinated as the heat of your hand appears to boil methanol in these ingenious pens. The actual boiling point of methanol is 67°C so the liquid can't be boiling, but what's happening? As the heat from your finger warms the methanol it expands being forced up a small glass tube and giving the excellent illusion of a boiling liquid. These pens provide hours of fun and come at a great price too!
The liquid is contained in glass therefore it is unsuitable for children.
Ages 16+.
Online
price: £
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