The experiment entitled “Linear Expansion” aimed to determine the coefficient of linear expansion of a
metal rod, and determine the factors affecting the change in length in thermal expansion. The students
prepared the material given and preceded to the experiment proper. The experiment made use of an
expansion base set-up and two different metal tubes one at a time. The first metal tube is copper and the
other is aluminum. The experiment is started with a preheating of water to produce steam. Afterwards,
the experiment proceeded in determination of initial length and temperature followed by the change in
length and temperature. The coefficient of linear expansion is computed, as well as, the percentage error.
The result yielded a value of coefficient of linear expansion of 0.0000231 for copper having 37.5% error
and 0.0000331for aluminum having 39.2% error. Data analysis revealed that a certain expansion will
occur if an object was heated. In addition, the final temperature is not 100°C since it is in a non-ideal
condition. Moreover, the values of coefficients of linear expansion of the actual are not equal to the
experimental. Results also revealed that there is a direct proportionality between the change in
temperature and in length.
When a substance is heated, the tendency is for
the atoms and molecules of that substance to be
excited, thus, it will move faster and farther until
it became stable again. This movement of atoms
causes an expansion of some physical aspects of
the substance. All states of mater (solids, liquids,
expands when heated and contracts when cooled
application of this is when opening the lid of a
jar. One often heat the lid of the jar in order to
thermal expansion. Once the lid is heated the lid
expands a very minimal amount that it loosens
its tight grip with the jar.
One of these thermal expansions is the expansion
of length of a substance, the linear expansion.
Linear expansion is the change in length due to
the change in temperature.
coefficient of linear expansion of a metal rod, and
determine the factors affecting the change in
length in thermal expansion.
Based from the nature of the experiment, it was
hypothesized that if the steam generator contains
water, then the final temperature of the tube
should be 100°C. In addition, if heat is applied,
then there must be a corresponding measurable
length that the solid expands. Moreover, if the
materials used are aluminum and copper, then
the coefficients of linear expansion obtained from
the experiment must equal the actual coefficient
of linear expansion of aluminum and copper.
MATERIALS AND METHODS