The document summarizes an experiment conducted by Ashwin Bhakre and Alex Daughtry to test if water takes longer to cool down from different starting temperatures. They hypothesized that hotter water would cool slower over 10 minutes. They measured the temperature drop of 100ml of water starting at 60°C, 70°C, and 80°C in a 250ml beaker every minute for 10 minutes. Their results showed that water cooled the most when starting at 80°C, dropping 27°C, compared to 10°C and 17°C drops for 60°C and 70°C water, disproving their hypothesis. Ashwin notes a potential confounding variable was leaving the 60°C water on a hot

1. Name: ASHWIN BHAKRE
Partners: ASHWIN, ALEX DAUGHTRY
Date of experiment: 24th and 29th September 2010
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Aim: We are trying to find out if water takes longer time to
cool down if the starting temperatures are different.
Hypothesis: I think the hotter the water is, the lesser it will
cool down in 10 minutes.
Variables:
Input variable: The starting temperature of the
water is our groups input variable. We shall change it by
keeping the measured amount of water on the flame for a
longer period of time.
Output variable: Our output variable is the time the
water takes to cool down. We shall measure it by using
stopwatches.
Control variables:
Control variable 1: Our first control variable is
the amount of water we are going to
use. I plan to keep it constant by using a
graduated cylinder to measure it out.

2. (What’s the temperature of the water?
You should give more details)
Control variable 2: Our second control variable
is the room temperature. I plan to keep
it constant by keeping an eye on the A/C
remote.
Control variable 3: Our third control variable is
the beaker we are going to use. I plan to
keep this one constant by using the same
beaker.(How big is the beaker? You
have to give a specific number )
Control variable 4: Our fourth control variable
is the thermometer we are going to use.
I plan to keep this one constant by using
the same (red oil) thermometer every
time so that there are no errors.
Control variable 5: Our fifth control variable is
the cooling time. We plan to keep this
the same by using a stopwatch to
measure out 10 minutes exactly.
Materials:
• Bunsen Burner
• Gauze mat
• Tripod
• Retort stand
• Boss head
• 250 ml beaker

3. • Graduated cylinder (100ml)
• Thermometer (red oil)
• Lighter
• Safety glasses/Apron
• Metal tongs
• Water(how much?)
• Bunsen Burner Mat
SORRY NO DIAGRAM !
Method:
1. Set up equipment and put on safety equipment.
2. Measure out exactly 100ml of water in a graduated
cylinder and pour it into the beaker.
3. Place the beaker (250 ml)on top of the Bunsen burner
and with the thermometer inside.
4. Turn the Bunsen burner on and wait till the designated
temperature of the water is reached.
5. Using the metal tongs pick up the beaker and place it
onto the Bunsen burner mat and start the stopwatch.
6. Observe the temperature drop for 10 minutes and
record data into your book for every minute.
7. Repeat the process with the 2 different starting
temperatures of the water.
Results:
STARTING STARTING STARTING
TIME IN TEMP. AT TEMP. AT TEMP. AT
MINUTES 60 ˚C 70˚C 80˚C
1 minute 58˚C 70˚C 80˚C

4. 2 minute 57˚C 69˚C 75˚C
3 minute 57˚C 67˚C 71˚C
4 minute 56˚C 64˚C 67˚C
5 minute 56˚C 61˚C 64˚C
6 minute 54˚C 59˚C 63˚C
7 minute 53˚C 57˚C 59˚C
8 minute 52˚C 55˚C 57˚C
9 minute 50˚C 54˚C 55˚C
10 minute 50˚C 53˚C 53˚C
TOTAL 10˚C in 10 17˚C in 10 27˚C in 10
TEMPERATURE minutes minutes minutes
DROP
Conclusion:
My hypothesis was proved wrong because our results
clearly showed that in 10 minutes time the 60˚C water
dropped only 10˚C while the 70˚C water dropped 13˚C and

5. 80˚C water dropped a whooping 23˚C. There was one
factor that I think must have affected the experiment the
most. This experiment was conducted in two different
lessons so in the first lesson after I had heated the water up
to 60˚C I had just let it stay on the gauze mat and cool. But
on the other lesson for the other two tests I had taken the
beaker off the gauze mat and put it on the Bunsen burner
mat. I think because of leaving the beaker on the gauze mat
the water did not cool down as much as the others because
the gauze mat must have been hot too which might have
made the cooling down process slower.
Evaluation:
I think my experiment gave accurate results from the
second two tests but the first one kind of spoiled it but it
still proved my hypothesis wrong so I would call this a
successful experiment because there is something that
always goes wrong in experiments and we should learn
from that mistake. I sure have learnt something from it,
which is that you should always do the same thing in an
experiment because if you don’t it can change the whole
results by a mile. Next time I do this experiment I would
try to make my measurements more accurate and keep
things constant for each test. I think this experiment was a
good one because I learnt something from it.
Good report, it is very specific, but it would be better if you
have more details.