Heat capacity and energy
Question:

Different materials heat up in different rates. This phenomena is important and could be seen everywhere in our daily life: When we are heating different foods on the stove, when we go to the beach and feel the hot sand compared to the cool water, and many more. The term "specific heat capacity” is the amount of energy (heat) required to change the temperature of one mass unit of a substance by one degree celsius. Specific heat capacity, therefore,  has units of energy per mass per degree. Each material has a different specific heat capacity. Please look at the video below and answer the following question.




Specific heat capacity of water is 4.2 KJ/(Kg 0c) and specific heat capacity of milk is 3.8 KJ/(Kg 0c).  According to the video that you saw, if you will heat 100gr of water and 200gr of milk at same initial temperature, for the same time and on the same stove, which fluid will be hotter at the end of heating?


2 People tried to answer this question

The milk will be hotter, since it has lower specific heat capacity, so it's easier to warm it.

The Water and the milk will be at the same temperature since they both warmed on the same stove and for the same time period.


The water will be hotter, since it's lower weight is much more significant then it's higher specific heat capacity.



We could not know, since the water has lower weight but higher specific heat capacity.



Correct! 3 factors influencing the temperature difference: the invested energy (which is the same), the mass and the specific heat capacity of the material. the mass of the milk is twice the mass of the water, but the specific heat capacity of the milk is less then twice of the water. hence - it's easier to heat the water so they will be hotter.

Incorrect. We know the proportions between the masses and the specific heat capacities, so we can decide, according to it, which of them will be hotter at the end of the process.

Incorrect - the fact that the milk lower specific heat capacity is not the only factor influencing the heating process hasbut also the mass 


Incorrect. We know the proportions between the masses and the specific heat capacities, so we can decide, according to it, which of them will be hotter at the end of the process.




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History of edits
Edited BY: Matan Maskit Edit Date: 2016-08-19 18:48:47
Created By: Matan Maskit Edit Date: 2016-08-19 18:35:29
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