Which one is heavier among$1 \mathrm{Kg}$of cotton and $1 \mathrm{Kg}$of iron?

If $E$ and $H$ represents the intensity of electric field and magnetizing field respectively, then the unit of $\frac{E}{H}$ will be:

Convert the following:

$568 \mathrm{cm}$into $\mathrm{m}$.

Look around and name at least two things that are measured in centimetre.

$22.4 \mathrm{cm}$ into $\mathrm{mm}$.

Look around and name at least two things that are measured in metre.

Look around and name at least two things that are measured in millimetre.