If you leave a cup of hot tea standing in the kitchen for whole day what will happen to its temperature?

When you leave a cup of hot tea standing in the kitchen for a whole day, its temperature will eventually reach room temperature. This is because of the second law of thermodynamics, which states that in a closed system, entropy (or randomness) always increases over time. In this case, the closed system is the cup of tea and its surroundings, and the entropy is the amount of heat energy that is transferred from the tea to its surroundings.

The heat energy from the tea will transfer to the air in the kitchen through conduction, convection, and radiation. Conduction is the transfer of heat through direct contact, so the tea will transfer heat to the cup, which will then transfer heat to the air. Convection is the transfer of heat through the movement of a fluid, so the hot air around the tea will rise and be replaced by cooler air, which will then be heated by the tea. Radiation is the transfer of heat through electromagnetic waves, so the tea will emit infrared radiation, which will be absorbed by the objects in the kitchen.

Over time, the tea will lose more and more heat to its surroundings until it reaches the same temperature as the room. This process can be sped up by stirring the tea, which increases the surface area of the tea that is in contact with the air, or by placing the tea in a refrigerator or freezer, which will reduce the temperature of the air around the tea.