By what property can the temperature difference be determined if the state of a substance does not change during the absorption of a given amount of heat?

In engines,water is used as a coolant because ......

$A$ heater supplying constant power $P$ watts is switched $ON$ at time $t=0$ to raise the temperature of a liquid kept in a calorimeter of negligible heat capacity. $A$ student records the temperature of the liquid $T(t)$ at equal time intervals. $A$ graph is plotted with $T(t)$ on the $Y$-axis versus $t$ on the $X$-axis. Assume that there is no heat loss to the surroundings during heating. Then,

Heat given to a body which raises its temperature by $1\ ^oC$ is

Water is used to cool radiators of engines,because

Write the old and new definition of calorie.