# Si and cgs units of all physical quantities pdf

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## Physical Quantities: Dimensions and Units

To explain the natural phenomena we take the help of physics. Physics enable us to understand logically as well as mathematically all natural phenomena. All the laws of physics are generally expressed in terms of Physical Quantities. As an example, if you go to school or college from your home by walk, you need to know your speed and time. If you start to go at AM and reach at 10 AM, you spend 30 minutes by walk.

Thus from the above example, time, speed and distance are Physical Quantities. Some other kinds of physical quantities are force, momentum , temperature, density, area, pressure , acceleration, etc. We need to measure the physical quantities to obtain physically meaningful results to understand physics. So measurement is necessary for physics. Generally, Physical Quantities are classified into two classes such as fundamental and derived quantities.

Fundamental Quantities : They are not defined in terms of other physical quantities. Example : Length, Mass and Time. Derived Quantities : Their definition derived from mainly fundamental physical quantities. Example : speed, area, acceleration, momentum, density, etc. In case of speed to define it, you need to two fundamental quantities like Length and time. Physical quantities are also classified into two types one is Scalar and the other is Vector quantity. Speed, density, mass, work, energy, power , etc are scalar.

Force, momentum , displacement, acceleration, velocity, etc are vector quantities. Like force is a vector quantity and denoted by —. Now if you push a table along north direction by applying force 5 Newton, then according to vector rule, it is written as 5N-North. Here 5 is a scalar and if you put its direction here North , it becomes a vector. To measure the physical quantities we need to introduce standards and units.

Measurement of physical quantities consists of two steps —. Here the choice of the standard is known as Unit. A comparison of the standard to the quantity to be measured provides the total measurement of that quantity. Consider the length of a pen, it is about 10 cm long.

Units depend on choice. Each choice of units leads to a new system or set of units. You may consider any length as a unit of length. But it is not standard. Earlier, people from various countries used different systems of units. Fundamental Units : can not be derived from other unit. Three fundamental units are Meter, Kilogram and Second. Derived Units : can be derived from other units.

Unit of Length : In SI system the unit of length is meter. For the large distance, we used Kilometer, Mega meter mile, etc. To measure the distance in space we used the astronomical unit or AU, light-year, and parsec.

Units are also classified into various types such as C. S, etc. CGS is for a small unit and mks are for larger. One kg is defined as the mass of a particular solid cylinder of platinum-iridium alloy kept at Sevres. To measure the large masses we used tonne. Unit of Time : In SI system the unit of time is second.

But in modern physics, 1 second is redefined as atomic clock such as time is taken to complete periods of transition of the two hyper levels of the ground state of the Caesium atom.

Physical Quantities All the laws of physics are generally expressed in terms of Physical Quantities. Classification of Physical Quantities: Generally, Physical Quantities are classified into two classes such as fundamental and derived quantities.

Classification of Physical quantities in terms of Direction: Physical quantities are also classified into two types one is Scalar and the other is Vector quantity. Like force is a vector quantity and denoted by — Now if you push a table along north direction by applying force 5 Newton, then according to vector rule, it is written as 5N-North.

Standard and Unit: To measure the physical quantities we need to introduce standards and units. Measurement of physical quantities consists of two steps — one is a choice of the standard and the other is a comparison of the standard to the quantity to be measured. Classification of Units: Units are also classified into two types Fundamental Units : can not be derived from other unit. ## List of physical quantities

To explain the natural phenomena we take the help of physics. Physics enable us to understand logically as well as mathematically all natural phenomena. All the laws of physics are generally expressed in terms of Physical Quantities. As an example, if you go to school or college from your home by walk, you need to know your speed and time. If you start to go at AM and reach at 10 AM, you spend 30 minutes by walk. Thus from the above example, time, speed and distance are Physical Quantities. Some other kinds of physical quantities are force, momentum , temperature, density, area, pressure , acceleration, etc. importance from which all other possible quantities can be derived. Those fundamental TABLE II: SI Examples of Derived Quantities and Their Units. Property.

## all units of measurement list pdf

Historically, the … eg. Common Core State Standards Browse and download resources, units and lessons by curriculum code or learning area. The unit of measurement used when calibrating the drawing is now the default for all measurements on that page.

Physicists, like other scientists, make observations and ask basic questions. For example, how big is an object? How much mass does it have?

This is a list of physical quantities. The first table lists the base quantities used in the International System of Units to define the physical dimension of physical quantities for dimensional analysis. The second table lists the derived physical quantities. Derived quantities can be mentioned in terms of the base quantities. Note that neither the names nor the symbols used for the physical quantities are international standards. 