fundamental physical quantities

There are 7 physical quantities viz., Length, mass, time, temperature, electric current, luminous intensity and amount of substance. Length, mass and time are called fundamental physical quantities..

Fundamental and Derived Units - The units of fundamental physical quantities are called fundamental units. They are length, mass and time. These units can neither be derived from one another nor can be resolved into any other units. They are indepen..

The units of fundamental physical quantities are called fundamental units. They are m, kg and sec. These units can neither be derived from one another nor can be resolved into other units. They are independent to each other. Units of physical ..

It is the term which tells about the power with which a fundamental quantity is contained in a physical quantity..

Measurement of Temperature - Temperature is a physical quantity and hence, measurable. In fact in SI system, temperature is a fundamental physical quantity. By our bodily sensation, we can say which object is hot and which is cold. But such a decisi..

Dimensional formula - It is the term which tells about the power with which a fundamental quantity is contained in a physical quantity. E.g., Dimensional formula of velocity is [LT - 1 ], that of density is [ML - ..

Summary - International System of (SI) unit has been adopted for measurement by scientists all over the world. Three fundamental units needed in physics are those of lengths, mass and time. Units of all other physical quantities we come across in physics..

Measurements - Everything that we use in our daily life is ultimately governed by principles of physics. All gadgets we use everyday at home, bicycles and cars, all different types of machinery and instruments, work on principles of physics. Hence to understand even the elementa..

. A refrigerator transfers heat from a colder to a hotter body, but its operation requires an input of mechanical energy or work. Generalizing this observation, we state: It is impossible for any process to sole result in the transfer of heat from a cooler to a hotter body. We call this the 'refrig..

where F(=N A e) is a fundamental constant and is called Faraday's constant. Its value is 96487 C mol - 1 . Faraday's constant is equal to the amount of charge required to liberate the mass of a substance during electrolysis equal to its chemical equivalent (in gm). Equation (1) is the com..