Question 1:
Why is the heating coil in an electric kettle placed at the bottom of the kettle?
Answer:
The heating of water begins around the coil of the heater. Hot water moves upwards and cold water moves downwards. This convection process enables the water to be heated faster.
Why is the heating coil in an electric kettle placed at the bottom of the kettle?
Answer:
The heating of water begins around the coil of the heater. Hot water moves upwards and cold water moves downwards. This convection process enables the water to be heated faster.
Question 2:
The chicken that we roast in an oven is usually wrapped in an aluminium foil. Why?
Answer:
The aluminium foil is a good heat conductor that can hasten the process of cooking the chicken.
The chicken that we roast in an oven is usually wrapped in an aluminium foil. Why?
Answer:
The aluminium foil is a good heat conductor that can hasten the process of cooking the chicken.
Question 3:
Why is a polystyrene container used to store ice cubes?
Answer:
A polystyrene container is a heat insulator that prevents heat from the surroundings reaching the ice cubes. So, the process of melting of the ice cubes can be slowed down.
Why is a polystyrene container used to store ice cubes?
Answer:
A polystyrene container is a heat insulator that prevents heat from the surroundings reaching the ice cubes. So, the process of melting of the ice cubes can be slowed down.
Question 4:
Amirah uses a thick blanket for sleeping during cold weather. What is the function of the blanket?
Explain your answer.
Answer:
The blanket functions as a heat insulator.
The heat from the body is trapped in the blanket and it controls the body temperature so that it is not too cold.
Amirah uses a thick blanket for sleeping during cold weather. What is the function of the blanket?
Explain your answer.
Answer:
The blanket functions as a heat insulator.
The heat from the body is trapped in the blanket and it controls the body temperature so that it is not too cold.