 Okay, so it turned out it took one minute for 20 ml of water's temperature to change by 4.5 degrees Celsius and it took 1 minute 50 seconds for 40 ml of water's temperature to change by 4.5 degrees Celsius. Now, why is there a time difference? We see there is a change in volume in both these cases, right? In the top beaker there is 20 ml, in the bottom beaker there is 40 ml, double the volume. So, it turns out when the volume is increased, all the supply heat energy has to spread to a greater space. So, it takes more time. That is what is happening in the second case. In order to change the temperature by the same amount, 4.5 degrees Celsius. In the second case, heat has to be spread to a greater volume, so it is taking more time. So, we can say that the amount of heat required to change the temperature of a substance by some degrees depends on the volume that you are taking. And we can also connect it to mass because in this case, you can say that the second beaker will have a greater mass, right? So, we can also say that the amount of heat required to change the temperature of a substance also depends on the mass that you take. In this case, in the second beaker, there is more mass of water, so it is taking greater time to change the temperature by 4.5. In the first case, there is lesser mass, so it is taking lesser time for the change in temperature.