A metal sphere is heated. Maximum percentage increase occurs in its..

$\alpha :\beta :\gamma =1:2:3$

$\left(\frac{∆l}{l}\times 10\right)0=\alpha ∆\theta \times 100$,    $\left(\frac{∆A}{A}\times 100\right)=2\alpha ∆\theta \times 100$,      $\left(\frac{∆V}{V}\times 100\right)=3\alpha ∆\theta \times 100$

Hence maximum percentage increase will be due to the volume.

Density will decrease when substance is heated.