Heat transfer between two substances is affected by specific heat and the chemical composition of the substances. state of matter of the substances at room temperature. thermal equilibrium of the substances. amount of time and area of physical contact between the substances.

I think the answer is the last one.

Amount of time and area of physical contact between the substances.

Option (d) is the correct answer.

Explanation:

One factor due to which heat transfer occurs is when two objects of different temperature are kept in contact with each other. Also, it is important that sufficient time should be provided to let he heat exchange between the two objects respectively.

For example, a spoon placed in a cup of hot coffee becomes warm when touched after an hour.

Therefore, we can conclude that heat transfer between two substances is affected by amount of time and area of physical contact between the substances.

this is a good question! i'll do some research and come back when i have the answer!