With the rise of temperature,the surface tension of a liquid

$A$ thin metal wire of density $\rho$ floats on the water surface horizontally. If it is $\text{NOT}$ to sink in water,then the maximum radius of the wire is proportional to $(T = \text{surface tension of water}, g = \text{gravitational acceleration})$.

Two pieces of glass plates placed one upon the other with a little water in between them cannot be separated easily because of:

If temperature increases,the surface tension of a liquid

Soap helps in cleaning clothes,because

Why does the free surface of a liquid tend to contract?