Units and Dimensions
What are the 7 dimension units?
The seven dimension base units are as follows –
- Length – meter (m)
- Time – second (s)
- Amount of substance – mole (mole)
- Electric current – ampere (A)
- Temperature – kelvin (K)
- Luminous intensity – candela (cd)
- Mass – kilogram (kg)
What is the SI unit of speed?
The SI unit of speed is m/s or m s-1.
What is the SI unit of temperature?
The SI unit of temperature is kelvin.
What is the SI unit for energy?
The SI unit of energy is joule.
What are Dimensional Variables?
The physical quantities which have dimensions but do not have fixed numerical value, is called the Dimensional Variables. Examples : velocity, acceleration, force, work, power, etc are the examples of Dimensional variables.
What is Dimensional Analysis?
Dimensional analysis can be defined as the process of checking relations among various physical quantities by using the dimensions of the physical quantities. These are independent of the numerical values and constants.
What are Dimensional Constants?
The physical quantities those have dimensions and have fixed values, are called dimensional constants. For Example:
- Gravitational constant (G)
- Planck’s constant (h)
- Velocity of light in a vacuum (C)
- Universal gas constant (R)
What is Law of Homogeneity of Dimensions?
Principle of Homogeneity states that dimensions of each of the terms of a dimensional equation on both sides should be the same.
Units and Dimensions
Units and Dimensions is a fundamental and essential topic in Physics. For the measurement of a physical quantity, Unit plays a vital role. Unit provides a complete idea about the measurement of a physical quantity. Dimension is a measure of the size or extent of a particular quantity.
In this article, we will learn Units and Dimensions related all details including definition, fundamental and derived units, system of units, List of Units of physical quantities, Dimension formula, List of physical quantities and their dimensions, etc.
Table of Content
- What are Units?
- Fundamental and Derived Units
- What are Dimensions?
- Dimensional Formula
- Dimensionless Quantities