If a liquid is heated in weightlessness,the heat is transmitted through

What is heat transfer? Write its modes. In which mode,medium is not required?

The bottom of a lake is at $0^{\circ} C$ and the atmospheric temperature is $-20^{\circ} C$. If $1 \, cm$ of ice is formed on the surface in $24 \, h$,then the time taken to form the next $1 \, cm$ of ice is ......... $h$.

Two thin blankets keep more warmth than one blanket of thickness equal to these two. The reason is

When the two ends of a metal rod are maintained at different temperatures and after some time every point of the rod attains a constant temperature,then:

The quantity of heat which crosses unit area of a metal plate during conduction depends upon