Which instruments are used to measure pressure and temperature?

The density of the solution is $2.15 \ g \ mL^{-1}$,then the mass of $2.5 \ mL$ solution in correct significant figures is $........ \ g$.

Select the $INCORRECT$ statement/s from the following:
$(a)$ $22$ books have infinite significant figures
$(b)$ In the answer of calculation $2.5 \times 1.25$,the result has four significant figures.
$(c)$ Zeros preceding the first non-zero digit are significant.
$(d)$ In the answer of calculation $12.11 + 18.0 + 1.012$,the result has three significant figures.

$A$ picometre is written as

Define density and provide its $SI$ unit.

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