Fundamental Quantities

                  There are 7 fundamental quantities, namely: length, mass, time, temperature, electric current, amount of substance, and luminous intensity. 

Length.  In daily life, length is used for measuring distance, thickness of a book, etc. In science length represents the distance between two points, for instance the length of the side of a triangle is the distance between two corners of the triangle. The SI  of length is meter (m). 

Mass. The amount of materials in the substance is called mass. Mass is not the same as weight. The mass is determined by the contained materials and fixed state although the object’s position changes. Weight depends on the position of the object on the earth and is affected by the gravitational force. In SI, mass uses fundamental unit of kilogram (kg) and is measured with lever balance while the unit of weight is Newton (N) and is measured with spring balance. 

Time. Time is the duration between two events. For example, daylight is between the sunrise and sun set. Life time is between birth and death. The SI unit for time is second (s). 

Temperature. Fire is hot but ice is cold. A hot object is said to have high temperature, but a cold object has low temperature. Thus temperature shows the degree of hotness and coldness of an object. The common measuring tool for temperature is a thermometer. 

     Questions:

1.      How many types of fundamental quantities are there? What are they?

2.      Give examples of objects around us that have length!

3.      What is ‘mass’?

4.      What is the difference between ‘mass’ and ‘weight’?

5.      What is ‘time’?

6.      What is ‘temperature’?

Written by TamaGuci

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