Heart diseases maybe: A symptom of tension/pressure inleft side of ribs/back is more likely a angina occure. Angina is chest pain or discomfort that occurs when the heart is working harder than usual. ...Read more.
The energy that is lost by the coffee and the mug is being transferred to the colder surroundings. We refer to this transfer of energy from the coffee and the mug to the surrounding air and countertop as heat. In this sense, heat is simply the transfer of energy from a hot object to a colder object.
Through this process, the molecules of the hot fluid transfer heat continuously toward the volumes of the colder fluid. For example, when heating up water on a stove, the volume of water at the bottom of the pot will be warmed up by conduction from the metallic bottom of the pot and its density decreases.