Question

Give a list of hot objects and cold objects?

Answer 1

Hint: In order to list the hot objects and cold objects, we have to first define what is the degree of hotness and coldness. Then, we will list some of the objects consisting of hotness and coldness of their temperatures. Temperature is the measure of hotness or coldness expressed in terms of any of several arbitrary scales and indicating the direction in which heat energy will spontaneously flow—i.e., from a hotter body (one at a higher temperature) to a colder body (one at a lower temperature).

Complete answer:
From the Second Law of Thermodynamics, we know that heat always flows from a body having higher temperature to a body having lower temperature and never in reverse direction. Hence heat flows from a hot body to a cold body.The Hotness and coldness of a body is always measured with respect to the reference body.

Hot body refers to those bodies from which we feel the presence of heat. In other words, we can say that the bodies which tend to increase the temperature of other bodies by releasing heat from them and hence increasing the temperature of the other are known as hot bodies. Here are few hot bodies which are listed below:
1. Sun
2. Lava from volcano
3. Air through chimneys
4. Cooking flame
5. Boiled milk kept in a glass

On the other hand, a cold body refers to those bodies from which we feel the presence of coldness. In other words, we can say that the bodies which tend to decrease the temperature of other bodies by absorbing heat from them and hence decreasing the temperature of the other are known as cold bodies. Here are a few hot bodies which are listed below:
1. Ice
2. Cold drinks and beverages
3. Air inside the refrigerator
4. Air from air conditioners
5. Ice-cream

Note: There are many such things that we can classify as hot and cold. Hotness and coldness are relative terms which are defined with respect to the reference body. When the temperature of two systems is the same, then the systems are in thermal equilibrium. Heat never flows from a cold body to a hot body.