$1 \, kg \, m^{-3} = \dots \, g \, cm^{-3}$

What is the $SI$ unit of mass? How is it defined?

Fill in the blanks given below:
$(i)$ At ........ ${\,^\circ }{\text{C}}$,the values of temperature in both ${\,^\circ }{\text{C}}$ and ${\,^\circ }{\text{F}}$ are equal.
$(ii)$ The number of significant figures in $0.03$ is .....
$(iii)$ The closeness of various measurements for the same quantity is called .........
$(iv)$ The agreement of a particular value to the true value of the result is called ....

The number of significant figures in $6.0023$ are

Which one of the following is not a unit of pressure?

Explain the scientific notation method of measurement.