Heat Loss Investigation Essay

2258 words - 9 pages

Heat Loss Investigation

Introduction
============

In this investigation I will investigate heat loss and heat transfer
in different materials and I will also investigate which materials are
the best insulators. A material that prevents this heat loss is called
an insulator and this helps to keep the object that is being insulated
warmer for, longer. Heat is generally transferred in three different
methods: -

- Conduction

- Convection

- Radiation

Conduction is energy transferred from the hotter part of a solid to
the colder part of conduction. It is transferred by the particles in
the material the particles in the hot part are vibrating more. These
vibrations are passed on to the cooler particles next to them, so the
energy spreads through the material until all particles have the same
energy. Metals are good conductors, whereas most non-metals are poor
conductors and poor conductors are used as insulators.

Convection is the transfer of energy by the movement of a liquid or
gas. When a liquid becomes warm it expands and becomes less dense. The
warmer fluid floats above the cooler fluid, which sinks. This creates
a flow, which is called convection current.

Radiation is when bodies emit radiation. Basically the hotter the
body, the more energy it radiates. Dark, dull surfaces emit more
radiation than light, shiny surfaces. They also absorb radiation well.
Light, shiny surfaces do not absorb radiation well - they are good
reflectors.

Radiation can pass through space - that is how the warmth of the sun
reaches the Earth.

Also heat can be transferred by evaporation and this may be relevant
in my investigation as I am dealing with water and the heating of
water. Also evaporation is when the particles near the surface of a
liquid and become a vapour. The particles that escape are those with
higher-than-average energy - otherwise they would not have enough
energy to escape. Because the liquid loses its higher energy
particles, the liquid that is left has less energy, so it becomes
cooler.

I will test two types of insulation to see which is the best at
preventing heat loss I will use black card, and tin foil to insulate
the beaker filled with water. I will also do this twice one in a small
beaker and once in a larger beaker. I will investigate also if I use
more water will this affect the heat loss. If I use more water will
this hold insulate the water more? So overall I will have four sets of
results.

Factors of the experiment
=========================

In this experiment there are many different factors that could affect
my experiment and the results I achieve, the factors are:

The amount of water used in each experiment - If I use a large of
amount of water this will mean that the water will cool down slower
and...

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