C11. 1. Physical Quantity

 1. Physical Quantity    Physics is the branch of science that deals with the natural laws in mathematical terms that determine the structure of the universe with reference to the matter and energy contained in it and their interactions. It is so broad that nature and behavior of atoms and subatomic particles and their...

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Heat and temperature

4. Heat and temperature Heat is a form of energy that produces the sensation of warmth and flows from hot body to cold body.  It is produced due to the vibration of molecules. When molecules vibrate faster more heat is produced. Matter is made up of molecules, these...

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Energy

Energy:  Energy is defined as the capacity to do work. Energy is a scalar quantity. The SI unit of energy is joule (J) and erg in CGS system. The amount of energy produced by a body is equal to the amount of work it can do when the energy is released. In nature there exists...

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Pressure

Pressure Pressure is defined as the force per unit area. It is a scalar quantity. Its SI unit is N/m2 or Pascal (Pa). If the force of different magnitude is applied on the same area, the pressure varies. Pressure is  more when more force acts on the body. Likewise, if...

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Force

Force Force is the external agent which changes or tries to change the state of rest or motion of a body. It is also called pull or push. Its SI unit is Newton (N). It is derived physical quantity. Since it has both magnitude and direction it is a vector quantity. Force...

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