Question

1. Defne conduction?
2. Ice is kept in a double walled container why?
3. Differentiate convection and radiation

Answer 1

1.Heat conduction (or thermal conduction) is the movement of heat from one solid to another one that has different temperature when they are touching each other. For example, we can warm our hands by touching hot water bottle.

2.
Double walled container are used to make ice box because the space two wall is kept with a vacuum which provides a insulation cover to the inner box, therefore the outer heat of the box can't after inside the box and melt the ice...

3. BASIS FOR COMPARISON CONVECTION RADIATION

Meaning		Convection refers to the form of heat transfer in which energy transition occurs within the fluid.	Radition alludes to the mechanism in which heat is transmitted without any physical contact between objects.
Represent		How heat passes through fluids.	How heat flows through empty spaces.
Cause		Due to density difference.	Occurs from all objects, at temperature
Occurance		Occurs in fluids, by actual flow of matter.	Occurs at a distance and does not heats the intervening substance.
Transfer of heat		Uses intermediate substance.	Uses electromagnetic waves.
Speed		Slow	Fast
Law of reflection and refraction		Does not follow	Follow