Why the atmospheric pressure changes with the changes of altitude?

Ans: The atmosphere for its weight applies force on the earth’s surface and the amount of force acting perpendicularly on per-unit surface area of the earth, is called atmospheric pressure. As the altitude increase, the length of the air column decreases. So, the weight it applies to per-unit surface area i.e. pressure decreases with the … Read more

No rest or no motion is absolute Explain it.

Ans: Whether an object is actually in rest or motion depends on the reference object. If the reference object or reference frame is actually at rest, the object at rest will be actually at rest with respect to that frame. This type of rest is called absolute rest. A body is said to be in … Read more

What is latent heat of fusion?

Melting point due to the application of heat, the solid remains unchanged until all the substances transform into a liquid. Here, the amount of heat required to transform the solid into a liquid is defined as the latent heat of fusion. This energy does not change the temperature of the solid but is used to … Read more