Question

Why does calcium start floating in water.

Answer 1

$\textbf{Calcium is a metal }$but still it starts floating in water because, when it dip in water.

It forms bubble thier, these bubbles surround the calcium and makes it less weight, resulting to it calcium floats.

Answer 2

Calcium starts floating because the bubbles of hydrogen gas which are formed during the reaction stick to the surface of metal