The number of significant figures in $60.0001$ is

$2 \times 10^{8}$ atoms of carbon are arranged side by side. Calculate the radius of a carbon atom if the length of this arrangement is $2.4 \, cm$.

The numbers $17.0145$ and $21.0235$ were rounded to three figures after the decimal point. The resulting numbers, respectively, are

$1\,^{\circ}C$ rise in temperature is equal to a rise of

Which instruments are used to measure pressure and temperature?

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 $Pascal$.