Question

define scalar quantity_??​

Answer 1

Answer:

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Scalars

These are physical quantities which need only a magnitude and an appropriate unit for their complete specifications. For example mass, body temperature, energy needed to perform some task etc. All these are scalar quantities as they do not have any direction associated with them. Such quantities can be added or subtracted using the rules of simple algebra. However we have to take care of a few things while doing so. These are

• Only similar quantities can be added or subtracted i.e., the quantities having same units.

For example, if the mass of an empty box is 5 kg, and it is filled with 10 kg of grains, then the total mass of the box now becomes 5 kg + 10 kg 15 kg.

It does not make any sense when we talk of adding mass of the box to the total volume of the box.

• The quantities having different units can only be divided or multiplied with each other.

Answer 2

Scalar quantity :

The quantity in which only magnitude is required to represent the quantity is called scalar quantity.