Investigating the Factors Affecting How Quickly Hot Water Cools

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Investigating the Factors Affecting How Quickly Hot Water Cools

Aim: -to sees how quickly water-cools after boiling at different

volumes of water with lids on.

Background: - heat can be lost in many ways and also gain. In human we

gain heat by chemical reactions happening mostly in contracting cells

of active muscle and the cells of the liver. We also gain it from the

sun, which is absorbed through the skin and by eating hot food and

drinks.

Heat is lost to the air by exposed surfaces of the body by conduction

convection and radiation. Heat is also lost by evaporation. The cold

air we breathe in and cold food and drinks products absorb heat and

take heat away. We also lose or gain heat by moving into a colder or

warmer place or by taking off or putting on a piece of clothing and to

take exercise to keep warm.

WHAT HAPPENS TO MOLECULES WHEN THEY ARE HEATED?

When molecules are heated the molecules vibrate faster and faster and

kinetic energy of the particles increases. In the end they have so

much kinetic energy that the particles begin to separate and move more

freely.

HOW DO BIRDS CONSERVE THEIR BODY TEMPERATURE HIGHER THAN THEIR

SURROUNDINGS?

When the temperature is cold birds tend to ruffle their feather, if

you have seen a bird do this they look fatter than they actually are.

What they're doing is trapping air between their feathers and warming

the air. This acts as an insulator and therefore keeps their body

temperature higher than the surrounding.

Hypothesis: - the breaker with the least amount of water in it will

show that it will cool down faster over a period of time because there

are less molecules vibrating together and bumping into each other and

therefore will cool down quicker.

A table of variables

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Name of variable

How will it be changed?

Water (independent variable)

The water is changing by the volume in the beaker.

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