Investigating Factors that Affect Heat Loss
PROBLEM
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I have been asked to investigate the link between colour and heat
loss. Does the silver or the black cup lose its heat faster?
HYPOTHESIS
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I think that the black cup will lose heat faster than the silver cup
because black absorbs heat, then releasing it out of the cup into the
surrounding air and surface, where as the silver cup will reflect the
heat back into the cup therefore keeping the water hotter for longer.
SCIENTIFIC KNOWLEDGE
Basically it is due to three factors CONDUCTION, CONVECTION and
RADIATION.
1. CONVECTION - the hot water in both cups will have convection
current in them. The hot water will rise and sink as the water begins
to cool. This means the heat energy is being passed on to the metal
cup over most of its inner surface.
2. CONDUCTION - the metal cups will get hotter as a result of the heat
energy inside the cup. The water will pass on this heat energy due to
the fact that metal is a good conductor of heat. The heat energy will
be conducted throughout the metal cup to the outer surface where it
will be transferred to the air around the cup as radiation.
3. RADIATION - hot objects (i.e. the metal cup) emit mainly INFRA-RED
radiation, and the hotter the object the more radiation it will emit.
How much radiation the object emits will depend on the surface. The
black cup had a dark matt surface and therefore will emit more
radiation. This will mean that the black cup will lose more infra-red
radiation than the silver cup (which is a poor emitter of infra-red
radiation) and as a result it will lose its heat quicker than the
silver cup over the same amount of time.
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EQUIPMENT
The equipment that I used:
· Thermometer
· Metal cups (silver and black)
· Timer
METHOD
The purpose of this lab was to calculate the specific heat of a metal cylinder
When there is a heat exchange between two objects, the object’s temperature will change. The rate at which this change will occur happens according to Newton’s Law of heating and cooling. This law states the rate of temperature change is directly proportional between the two objects. The data in this lab will exhibit that an object will stay in a state of temperature equilibrium, unless the object comes in contact with another object of a different temperature. Newton’s Law of Heat and Cooling can be understood by using this formula:
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take heat away. We also lose or gain heat by moving into a colder or
A hot plate is acquired and plugged in and if left to warm up. Fill two beakers with 0.075kg of water and record the temperature using a thermometer and record it. Place one of the beakers onto the hot plate and drop one of the metal objects in. Wait for the water to boil and wait two minutes. Take the object out of the water and drop it into the other beaker. Take the temperature of the beaker and record the rise in temperature.
good emitter of heat radiation so a lot of heat will be lost to the
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Hypothesis- If we use the felt material to insulate the cup, then the hot beverage in the cup would stay warm longer than the others.
The objective of this experiment was to identify a metal based on its specific heat using calorimetry. The unknown metals specific heat was measured in two different settings, room temperature water and cold water. Using two different temperatures of water would prove that the specific heat remained constant. The heated metal was placed into the two different water temperatures during two separate trials, and then the measurements were recorded. Through the measurements taken and plugged into the equation, two specific heats were found. Taking the two specific heats and averaging them, it was then that
heat will stay in the cup and can only escape by rising to the surface
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