If an object weighs $275 \ lb$,what is its weight in $kg$? $(1 \ kg = 2.205 \ lb)$

The prefix zepto stands for

What do you mean by significant figures?

Describe the temperature scales used to measure the properties of matter.

The number of significant figures in $6.02 \times 10^{23}$ is

Pressure is defined as the force acting per unit area of a surface. The $SI$ unit of pressure,$Pascal$ $(Pa)$,is defined as $1 \ Pa = 1 \ N \ m^{-2}$. If the mass of air at sea level is $1034 \ g \ cm^{-2}$,calculate the pressure in $Pascal$.