Question

heat causes expansion because ........................................a) it occupies space b) matter triesto escape from heat c)of increase in a movement of molecules d) none of these

Answer 1

answer is c this is right answer

Answer 2

Answer:

(c) of increase in a movement of molecules

Explanation:

On heating, the movement of molecules increases which eventually increases the average distance between the molecules, thereby causing expansion.

Heat

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object. Such energy transfer can occur in three ways namely, radiation, conduction and convection.

• Radiation heat transfer: It is a process in which heat waves are emitted that may be absorbed, reflected or transmitted through a colder body. Sun heats the earth by electromagnetic waves. Hot bodies emit heat waves.
• Convection heat transfer: It is the transfer of heat between two bodies by currents of moving gas or fluid. In free convection, air or water moves away from the heated body as the warm air or water rises and is replaced by a cooler parcel of air or water.
• Conduction heat transfer: Conduction is the process by which heat is transferred from the hotter end to the colder end of an object. The ability of the object to conduct heat is known as its thermal conductivity, and is denoted k. Heat spontaneously flows along a temperature gradient.

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