You feel hot when there is a temperature difference between your skin and the environment.
Your body has a way to refresh: sweating. The body stores the heat in some water and then evacuates it. Then, the sweat evaporates, leading to a temperature difference between air and skin.
But when you are in a hot bath, the sweat does not evaporate and then your skin does not cool down. So you don’t feel the difference of temperature as much.
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