experiment 5: linear expansion of metals

Question 1

when do objects undergo changes in dimension

Answer 1

when they are heated

Question 2

what is the objective

Answer 2

measure the coefficient of linear expression of some metals

Question 3

this change in length or area or volume

Answer 3

thermal expansion

Question 4

true or false:
At a given temperature, inter-molecular distances are definite.

Answer 4

true

definite - exact and does not change

Question 5

what happens when a body is heated

Answer 5

molecules vibrate more energetically against the action of inter-molecular forces
displacement of molecules increased

=
average distance btwn molc increases, the dimension of the body increases (body expands)

Question 6

expansion in length of solid bodies on heating

Answer 6

linear expansion

Question 7

coefficient of linear expansion

Answer 7

increase in length per unit original length per Kelvin rise in temp

Question 8

original length of the metal rod

Answer 8

L0
in room temp

Question 9

what equipment do u insert in the foam insulator

Answer 9

temperature sensor

• then turn on GLX Xplorer to record the temp of metal rod as initial temp (T0)

Question 10

what do u have to do as steam begins to flow

Answer 10

watch dial gauge and temp

Question 11

temp has reached equilibrium conditions

Answer 11

Tf
(remained steady for 3 to 4 minutes)

Question 12

expansion of tube length

Answer 12

Δ L

Question 13

calculate how much longer the metal got

Answer 13

∆L = Lf − L0

Question 14

formula to find the coefficient of linear expansion

Answer 14

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