If you touch something, there’s heat exchange.
Stuff that’s heavier (but just a big) contains more subatomic particles. And the more particles, the more thermal energy.
So if you step on something lightweight, like wood, the material directly in contact with your foot warms up more easily because there’s fewer particles to warm up.
And if you step on something heavy, like stone, there’s way more particles to warm up, so the stone stays cold longer, and there’s more thermal energy transferred from your foot to the stone.
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