Introduction: in which its particles travels in fluids

Introduction:

Conduction
is heat transferred through a medium which its particles do not move for
example when you light a fire under a spoon and when you touch the handle of
the spoon it will be hot. Convection is transferred through a medium in which
its particles travels in fluids (gas). This is a thermal heat experiment that
requires hot and cold water. We use  two containers of water, which are
identical in shape and also it has an identical amount of water. The only
difference between the two is that the water in one is at a higher temperature
than the water in the other one. If the hot water started at 99.9° C, and the
cold water started at 0.01° C, then it is clear that the original cooler water
would have frozen first. However, under some conditions the original warmer
water will freeze first. If that happens, you have seen the Mpemba effect which
describes that phenomenon. Mpemba effect is a theory that the hotter water
freezes faster than cold water but it does not always happened, cold water
often freezes first rather than the hot water.

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Research Question:

How
does the temperature of water affect their freezing time?

 

Hypothesis:

Cold
water will freeze faster than hot water because hot water needs longer time to
cool down. This is because the particles in hot water are moving faster than
particles in cold water, so it takes longer time for the particles in the hot
water to slow down than the cold water. A liquid can freeze when all of their
particles are moving really slow, so the hot water will freeze slower.

 

Variables:

Independent
Variable:

5
different temperatures of water (10?C, 30?C, 50?C, 70?C, 90?C).

 

Dependent
Variable:

The
time taken for each water to freeze, measured in minutes.

 

Control
Variable:

Mass
of each type of water
The
volume of each type of water
The
final temperature of both type of water
The
temperature of the environment (AC Temperature)
The
material of the container
Same
freezer
Same
Thermometer
Same
pan
Same
timer

 

 

 

Apparatus:

5x
500ml beaker
500ml
of 10?C water
500ml
of 30?C water
500ml
of 50?C water
500ml
of 70?C water
500ml
of 90?C water
1x
timer
1x
freezer
5x
camera
Thermometer
Pan
(for boiling)

 

Method:

Heat
each 500 ml of water to the intended temperature
Pour
each of them to each beaker
Put
on at a time and each camera to record on at a time into the freezer
Record
the time for the water to freeze using the timer
Record
the time needed by each type of water to freeze
Repeat
step number 3 to 5

 

Safety Guideline:

Be
careful when heating the water, so that you will not get hurt. Wear lab
coat and gloves if you really need it.

Dont’t
hold the pan because it is hot
Be
careful when you lift the boiling water make sure you are balanced.

If
you are not used to boil water, you should ask adults for help.

 

 

Works
Cited

“Does Hot Water Freeze Faster
than Cold Water?” Information about Does Hot Water Freeze Faster than Cold
Water? with Fizzics Education | Kids Science Experiments,
www.fizzicseducation.com.au/Free+experiments/Kitchen+chemistry/Does+hot+water+freeze+faster+than+cold+water.html.

MacDonald, Fiona. “Does Hot
Water Really Freeze Faster Than Cold Water?” ScienceAlert,
www.sciencealert.com/does-hot-water-really-freeze-faster-than-cold-water.

“Mpemba Effect: Why Hot Water
Can Freeze Faster than Cold.” Phys.org – News and Articles on Science and
Technology, phys.org/news/2010-03-mpemba-effect-hot-faster-cold.html.