Define what is meant by specific latent heat.
An electrical heater is placed in some ice that is melting and is held in a funnel, as shown in Fig. 3.1. The heater is switched on and, once the ice is melting at a steady rate, the mass $m$ of ice melted in $5.0$ minutes is measured, together with the power $P$ of the heater. The power $P$ of the heater is then raised. A second reading of the mass $m$ of ice melted in $5.0$ minutes is taken when the ice is again melting at a steady rate. The values of $P$ and $m$ are given in Fig. 3.2.
Complete Fig. 3.2 by determining the mass melted per second for each power of the heater.
Use the data in the completed Fig. 3.2 to find a value for the specific latent heat of fusion $L$ of ice.
Use the data in the completed Fig. 3.2 to find the rate $h$ of thermal energy gained by the ice from the surroundings.