When an amount of water gets frozen its volume increases by 1/11 of the original volume. By what
part does the volume decrease then when the ice melts again?

2. Originally Posted by sri340
When an amount of water gets frozen its volume increases by 1/11 of the original volume. By what
part does the volume decrease then when the ice melts again?
If you have 1 volume unit ( $u_V$) of water which freezes to ice you'll get $1 u_V + \frac1{11} u_V=\frac{12}{11} u_V$

When the ice is melting to water obviously you'll get again $1 u_V = \frac{11}{11} u_V$. That means the volume of the ice must decrease by $\frac1{12} u_V$