Investigation of how Changing the Volume of Water in a Container Affects Its Rate of Heat Loss

Investigation of how Changing the Volume of Water in a Container Affects Its Rate of Heat Loss

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Investigation of how Changing the Volume of Water in a Container Affects Its Rate of Heat Loss

Aim :

To investigate how changing the volume of water in a container affects
its rate of its heat loss. The variable of this investigation is the
volume of water which is put in the container.

What I already know:

I already know that the larger the volume of water there is the less
heat loss occurs. I can tell this from my previous pilot experiment
where I investigated, if the volume of water in a beaker affects its
rate of cooling.

In this experiment my conclusion was the beaker with the larger volume
has no more heat energy to give out compared to the beaker with the
smaller volume.

Prediction:

I predict that the increase of water volume in the beaker will affect
the rate of heat loss; this is because of my results of the pilot
experiment which gave me an understanding of the variable in my
Investigation.

Equipment:

This is a list of all the apparatus I will need to use to investigate
my variable.

[IMAGE]

300ml Beaker: to contain the volume of H2O.

[IMAGE]

[IMAGE] Kettle : To heat up the H2O.

Thermometer: To measure the temperature of the H2O.

[IMAGE]

Stopwatch: To time the temperature of each volume of H2O every 30sec.

[IMAGE] H2O : To investigate the rate of cooling.

Diagram: This diagram shows the format and layout of my experiment:

Plan:

§ Collect Equipment needed for investigation.

§ Boil the water using the kettle.

§ Fill the beaker with the correct volume of water, then immediately
insert the thermometer into the beaker with the boiling water.
Remembering for safety reasons do not sit down while doing the
experiment.

§ Start the stop watch immediately not forgetting to record the
starting temperature. Take a reading from the thermometer every
30seconds, remembering to record results in a table.

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§ Repeat this until all volumes of H2O has been investigated, but
still using the same beaker for the next amount of water so it will be
a fair test.

§ A few pointers of fair testing:

1. Remember to make sure that the thermometer is upright so you can
take an accurate reading.

2. Make sure the Bulb of the thermometer is covered in the boiling
water.

3. Make sure when investigating a different volume of water you get
the thermometer back to the same starting temperatures as the previous
volumes.

* This is How I will display and record my results:

Time

Temperature

0

73

[IMAGE]30

68

Analysis

Trends and patterns:

The 100ml line, the 150ml line and the 200ml line have approximately 4
degrees difference from 240seconds into the experiment .This is
because convection is happening relatively at the same time for each
one.

On my graph of just 50ml, there is at least three obvious points of
temperature change these are marked on the graph. This is because they
are the points when convection seems to slow down concluding that the
temperature id cooling down. This theory is shown in my prediction and
all the information plotted on my graph shows that my prediction was
correct to my results.

Evaluation:

My results are accurate because we did everything that we could to
ensure this was a fair test. My results show that the more water there
is there longer its takes to cool down this is due to convection which
is when

The hotter particles get somewhere cooler they then transfer their
energy by the usual process of collisions which takes over the cool
particles and warms up the surrounding.

The results are reliable because they fit in with the laws of Issac Newton, which is that the rate of change of temperature of some body is proportional to the temperature difference of that body to its surroundings. Another way to say the same thing is that the rate of heat transfer through a substance is proportional to the difference in temperature across the substance. They are not odd results they do fit in with the pattern this is shown on my graph.

I could improve my plan by maybe having two or three variables these would make my investigation more detailed and perciffic.I could check this trend/patern by making another graph with just a single line of a water volume to show at which point does convection start to fade at.

The next experiment I could do to proive my varaible would be if I did
the same experiment but actully covered the top of the beaker to
prevent evapouration, to see which volume took the longest to cool
down.

The results are reliable because they fit in with the laws of Issac Newton, which is that the rate of change of temperature of some body is proportional to the temperature difference of that body to its surroundings. Another way to say the same thing is that the rate of heat transfer through a substance is proportional to the difference in temperature across the substance. They are not odd results they do fit in with the pattern this is shown on my graph.



The next experiment I could do to prove my variable would be if I did
the same experiment but actually covered the top of the beaker to
prevent evaporation, to see which volume took the longest to cool
down.
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