EVERYDAY SCIENCE - HEAT
Question 1

Ace carried out an experiment as follows.

He shone an infra-red lamp on one side of a concrete block (A). The infra-red radiation from the lamp will cause the surface of the concrete block to heat up and increase in temperature.

After 10 minutes, he measured the temperature at both sides of the concrete block, (A) and (B).

He repeated the experiment with 2 other concrete blocks with varying amount of air spaces within them. The results of the experiment are recorded in the table as shown.

HEAT oeq1.jpg
HEAT oeq1 RESULTS.jpg
Answer 1

Fill in the blanks with the keywords provided below.
[colder] • [thickness] • [more] • [poor conductor] • [air spaces] • [heat] • [less] • [distance]

a) What is the aim of the experiment?

Answer:

The aim of the experiment is to find out how the amount of in a concrete block will affect the amount of passing through the block.


b) What can Ace conclude from the experiment?

Answer:

When there are air spaces within a concrete block, less heat is able to pass through it.
Air is a of heat and will reduce heat flow through the block.


c) List 2 things that should be kept the same to ensure a fair test.

Answer:

The between the block and the infra-red lamp.
The of the block.


d) Some Inuit people live in igloos. Igloos can protect them from the cold weather because the temperature inside the igloo can be kept higher than temperature outside.
Explain why igloos are constructed using blocks of compressed snow instead of solid blocks of ice.

Answer:

As compared to a solid block of ice, a block of compressed snow has more air spaces within it. Air is poor conductor of heat. The warmer air within the igloo will lose heat to the surrounding air through blocks of compressed snow.




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“The difference between the outdoor and indoor temperature of an igloo could be up to 40 degrees Celsius!”