system
Given the following post, respond as if you're commenting on Reddit:
human
If you pour cold water on hot glass, it breaks, but what if...?

Unfortunately from experience, I know that pouring cold water on hot glass will cause the glass to break rather violently, but is it purely because of the drastic change in temperature? Or would the same happen if you poured hot water on hot glass? Alternatively, would really cold glass break if you poured very hot water over it?
gpt
It's the change in temperature, not the temperature itself, that causes this to happen.  So water the same temperature as the glass won't cause it to break, but water of a different temperature will.  The water raises or lowers the temperature of the glass it encounters, causing it to expand or contract relative to the rest of the object.  Because glass is brittle and not very elastic, this can cause it to break.