Investigating the Effect the Surface Area of an Organism on the Rate of Heat Loss
Introduction
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The surface area: volume ratio of an organism gets larger as the
organism gets smaller. As the surface area of an organism is what
affects heat loss, you are unlikely to get small animals such as
insects in the North Pole and large animals such as polar bears in the
desert but you do get large animals such as elephants in the desert
and small animals such as rabbits in the arctic. BUT: These are warm
blooded animals so can control their body temperature where as lizards
are cold blooded and do not have the ability to control it. Therefore
to make the experiment easier I will use water to represent a cold
blooded animal as water being an inanimate object, does not have the
ability to control its temperature like a cold blooded animal.
Aim
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The aim of this experiment is to find out the relationship between
surface area and rate of heat loss.
Variables
[IMAGE]
Prediction
As the volume of water increases, the rate of heat loss will decrease.
This is because the surface area to volume ratio of the higher volumes
is much lower than that of the smaller volumes, therefore the smaller
volumes will drop 100C very quickly compared to the higher volumes.
Method
I will use volumes 20,30,40,50,60,70,80,90 and 100cm3 of water at 700C
The water will be put in a beaker and the time for the temperature to
drop from 70-600C will be recorded. To start at 700C I will allow the
water at a higher temperature to cool.
Apparatus
Boiling tubes
Thermometers
Kettle (to heat water)
Stopwatches
Amendments
As the boiling tubes only hold 50cm3 I will use 10, 20, 30, 40 and
50cm3 of water to take results.
RESULTS
Time taken is given in minutes and seconds.
Volume Time taken 1 Time taken 2 Average
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The thermometer, containers, and iron ball were secured of any possible contaminants. The stopwatch was calibrated and checked to be correctly measuring the time in seconds and milliseconds, by comparison with other stopwatches. The thermometer was checked to be accurately measuring the temperature of lukewarm water, and was al...
on how long it takes to heat up. If we heat a large volume of water it
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