I live in a country where room temp is around 28C. When I leave food out, it feels cold in my mouth, but water which should be the same temperature does not. Why is this?
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Good question, it gets at some key principles of thermodynamics.
ELI5: Water is better at stealing your heat than solid food, like bread, even if they start at the same temperature.
ELI15: All materials have a property called their *coefficient of thermal conductivity*. This is a measure of how well the material can conduct heat. When you touch a metal railing outside in the winter, it is probably the same temperature as, say, the concrete sidewalk, but it will feel colder, because more heat is flowing from your hand to the railing, so your hand gets colder faster.
In the case of the water in your mouth, its *heat capacity* is also relevant. This is how much heat energy it takes to change the water’s temperature. Water has a very high heat capacity. This is the same reason why the ocean can still be warm in October – it hasn’t lost all its summer heat yet. Its also why water takes so long to boil on a stove. The water in your mouth will take a bunch of heat from your mouth to equalize their temperatures, whereas for the bread its mostly made of air and warms up quickly, and your mouth doesn’t end up changing much in temperature.
edit: Just reread your question and saw it was the opposite of what I thought. Same principles apply, though, think about how different foods behave! Also, it could be based on your expectation that the fold is supposed to be warm.
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