 Alright, the temperatures changed from 30.5 to 35 in both of these beakers. First one had 20 ml of water, second one had 20 ml of oil. It took lesser time in the case of oil. It took 46 seconds for the temperature to change from 30.5 to 35. But it took 1 minute for the temperature to change for the beaker with the water in it. So, why was there a time difference? Well, it turns out that the amount of heat required to change the temperature of a substance also depends on one quantity which is called specific heat. And specific heat depends on the nature of a substance. So, specific heat is different for different substances. It is different for water, it is different for oil. But what does specific heat mean? It is the amount of heat required to raise the temperature of 1 gram of any substance by 1 degree Celsius. And turns out that the specific heat of oil is less than that of water. So, that means that you need lesser amount of heat to raise the temperature of 1 gram of oil by 1 degree Celsius. And you need more heat to raise the temperature of 1 gram of water by 1 degree Celsius. So, therefore, it took lesser time for 20 ml of oil's temperature to change by 4.5 degree Celsius compared to 20 ml of water. It all depends on the specific heat.