Diagram B shows the time taken for the water to boil. When boilling, the frying pan and the water are in thermal equilibrium.
( Assume frying pan M and frying pan N are of the same size and same thickness)
(i) What is the meaning of the thermal equilibrium?
Apakah maksud keseimbangan terma?
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(ii) Using Diagram A and B, compare the specific heat capacity of the frying pan, the time taken for the water to boil and the change in temperature.
Relate the specific heat capacity of the frying pan with the time taken for the water to boil.
Make a deduction regarding the relationship between the specific heat capacity of the frying pan and the rate of change in temperature of the frying pan.
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(b) The amount of heat needed to increase the temperature of 1 kilogram water by 1 C in the frying pan M and frying pan N are Q1 and Q2 respectively.
(i) Compare Q1 and Q2. Give one reason for this answer
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(ii) Using Diagram A and B , name two types of heat that are involved during heating and boiling
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(c) Diagram C shows the cross-section of a pressure cooker.
You are required to give some suggestion to design a pressure cooker which can cook food in a shorter time.
Using the knowledge on heat, pressure and the properties of materials, explain the suggestions based on the following aspects:
(i) material used for the based of the pot
(ii) material used for the handle of the pot.
(iii) thickness of the wall of the pot.
(iv) Safety of the pressure cooker
(v) Way to prevent leakage of steam.