Convert the following into basic units

Solution:

(i) $28.7 \mathrm{pm}$ :

$1 \mathrm{pm}=10^{-12} \mathrm{~m}$

$\therefore 28.7 \mathrm{pm}=28.7 \times 10^{-12} \mathrm{~m}$

$=2.87 \times 10^{-11} \mathrm{~m}$

(ii) $15.15 \mathrm{pm}$ :

$1 \mathrm{pm}=10^{-12} \mathrm{~m}$

$\therefore 15.15 \mathrm{pm}=15.15 \times 10^{-12} \mathrm{~m}$

$=1.515 \times 10^{-12} \mathrm{~m}$

(iii) $25365 \mathrm{mg}$ :

$1 \mathrm{mg}=10^{-3} \mathrm{~g}$

$25365 \mathrm{mg}=2.5365 \times 10^{4} \times 10^{-3} \mathrm{~g}$

Since,

$1 \mathrm{~g}=10^{-3} \mathrm{~kg}$

$2.5365 \times 10^{1} \mathrm{~g}=2.5365 \times 10^{-1} \times 10^{-3} \mathrm{~kg}$

$\therefore 25365 \mathrm{mg}=2.5365 \times 10^{-2} \mathrm{~kg}$