PHYSICIAL QUANTITIES:
A physical quantity is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a value, which is the algebraic multiplication of a ' Numerical value ' and a ' Unit '. For example, the physical quantity of mass can be quantified as '32.3 kg ', where '32.3' is the numerical value and 'kg' is the Unit. A physical quantity possesses at least two characteristics in common.
Dimensions: A physical quantity has a certain number of dimensions, which are the basic units of measurement that are used to quantify it. For example, the dimensions of mass are length, mass, and time.
Units: A physical quantity has a certain unit of measurement, which is a standard way of measuring it. For example, the unit of mass is the kilogram.
Physical quantities can be classified into two types:
Fundamental Quantities: Fundamental quantities are those that cannot be defined in terms of other physical quantities.
Derived quantities: Derived quantities are those that can be defined in terms of fundamental quantities.
The seven fundamental physical quantities are:
1.Length (L)
2.Mass (M)
3.Time (T)
4.Electric current (I)
5.Temperature (Θ)
6.Amount of substance (N)
7.Luminous intensity (Iv)
1.Length (L)
2.Mass (M)
3.Time (T)
4.Electric current (I)
5.Temperature (Θ)
6.Amount of substance (N)
7.Luminous intensity (Iv)
The International System of Units (SI) is the most widely used system of units for measuring physical quantities. It is based on the seven fundamental physical quantities and their units.
Here are some examples of physical quantities:
1.Length: The distance between two points.
2.Mass: The amount of matter in an object.
3.Time: The interval between two events.
4.Electric current: The flow of electric charge.
5.Temperature: The degree of hotness or coldness of an object.
6.Amount of substance: The number of atoms or molecules in a substance.
7.Luminous intensity: The brightness of a light source.
Comments
Post a Comment