Heat can never flow from ________.
how come it is cold to hot?
The question is heat can never flow from_________.
We know that heat flows from hot to cold, so the answer is "cold to hot".
Cold is not a physical quantity, heat is (measured in calories or joules).
Heat can never flow from a colder object to a hotter object. According to the second law of thermodynamics, heat naturally flows from a region of higher temperature to a region of lower temperature until thermal equilibrium is achieved.
When it seems like heat is flowing from cold to hot, it is not actually the heat that is flowing; rather, it is the transfer of thermal energy. This transfer of thermal energy occurs due to the difference in temperature between the two objects.
To understand why it feels cold when you touch a hotter object, such as an ice cube on a warm day, you need to consider how heat is transferred. Heat can be transferred through three mechanisms: conduction, convection, and radiation.
In the case of conduction, which is the direct transfer of heat between objects in direct contact, heat will always flow from the object with a higher temperature to the object with a lower temperature. So, when you touch an ice cube, which is at a lower temperature than your body, heat is transferred from your warmer body to the colder ice cube. As a result, you feel the sensation of coldness.
Remember, heat transfer is different from the direction of heat flow. Heat flows from hot to cold, but thermal energy can be transferred from cold to hot through conduction, convection, or radiation.