The Powder Toy

What you're suggesting would imply that liquids would be distinguishable somewhat more than they are right now.    As is, heat convection in liquids is a function of heat, moving from ...

https://powdertoy.co.uk/Browse/View.html?ID=1902978    You can use particles to store energy by melting.

    Liquids already have a form of heat convection, in-game, as shown above.    Liquid is on Left, Solid is on Right.        In Heat Variation display.

You haven't turned evil yet. Mmmhmmhmhmhm.

This is cute actually.

..Being too slow wouldn't even be a problem. Good luck finding someone who wants to run redundant recursive simulations of TPT inside of one another.

..Well, no. I suppose in reality it'd sludge downwards, but you'd probably never get a noticeable draft from it. It's the same when you open a freezer, there's a short bit of air ...

    Strong differences in temperature make huge fluctuations in temperature, and -generally- hot air rises; cold air incidentally gets lifted up into the air and spread out all over the pla...

This isn't an issue of the air being cold specifically. You have an item with zero gravitational response sitting in simulation settings that push particles up when inside of heated air.. That o...

I'm not sure we need another basic metallic element. =/