Question

Answer the following questions. 1. What is unit? Write down the units of mass, temperature, power and density. grade 9 subject science​

Answer 1

Answer:

1. Measurment of any physical quantity involves comparison with a certain basis, internationally accepted reference standard called unit.

[the result of a measurement of a physical quantity is expressed by a number accompanied by a unit.]

unit of mass- kilogram(kg)

unit of temperature - kelvin(K)

unit of power - watt(W)

unit of density- kg per meter cube

Answer 2

Answer:

A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement. For example, a length is a physical quantity.

DENSITY

The SI unit for mass is kilograms(kg), for volume is cubic meter(m^3), for time is seconds(s), for temperature is kelvins(K)