The glass is creeping. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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The glass is creeping! Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Air expands when heated. Well, what does this creeping glass have to do with it? Now you will see. Take a piece of window glass or a mirror about 40 cm long. Wash this glass cleanly and place two matchboxes under one of its edges. Place a thin glass upside down on the glass. He, of course, will stand still: after all, the slope of the glass is very small.

Wet the rim of the glass well with water. No, and water "lubrication" does not help. The glass is still in place. Nothing, now we will make the lazy man move on! Come on, bring a burning candle or a splinter to him. Closer, closer, let him feel the heat.

The glass is still standing... Look, it's moving! Faster, faster crawling down, as if escaping from the fire!

The glass is creeping!

What happened here? The air in the glass warmed up and expanded slightly. He lifted the glass a little and would have gone outside, but the water that wets the edges is in the way. The glass seemed to "hang" on the water layer. Friction decreased sharply, and he crawled, or rather, swam down!

Author: Galpershtein L.Ya.

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