Does anybody know what this is called

It's basically just a glass bottle with some kind of liquid in it (I'm pretty sure it's a type of alcohol). When you hold the bottom of it, the heat of your hand forces the liquid up, and when you hold your hand at the top, all the liquid rushes down again.

Does anybody know what this is called? I need to know for a science experiment.

Thanks for answering. :)

They make Hand Boiler Toys to show kids the importance of science and heat transfer, just google hand boiler toy

not exactly sure what theyre called but ive seen them before as "love testers" lol. try looking for them by that type of merchandise

I know it's not a valid answer but I was thinking Moonshine lol