$22.71 \, L$ of a gas is equal to how many cubic meters $(m^3)$?

At what temperature will the values of $^\circ C$ and $^\circ F$ be equal?

Evaluate the following exponential numbers:
$(i)$ Add $8.56 \times 10^{6}$ and $10.64 \times 10^{5}$.
$(ii)$ Subtract $5.80 \times 10^{-4}$ from $3.33 \times 10^{-3}$.

Fill in the blanks given below:
$(i)$ The symbol for the quantity of luminous intensity is .......... and the name of its $SI$ unit is ......... .
$(ii)$ The prefixes used for $10^{-18}$ and $10^{18}$ are ............ and ........... respectively.
$(iii)$ The $SI$ unit of density is ......... .
$(iv)$ In the ........ unit of temperature,its negative value is not possible.

What do you mean by significant figures?

If the number of $H^{+}$ ions in $1 \ L$ of distilled water is $6.023 \times 10^{16}$,what is the number of $H^{+}$ ions in $1 \ mL$ of distilled water?