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igcse physics notesprinted 5 · PDF 5
124 pagesrevision 46936
printed 5 · PDF 5
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For these, a thread can be used to trace the outline of the object by placing
it close to the object and unravelling it till the object has been outlined. The
points where the object’s outline started and ended should be marked.
Then the thread can be straightened out and a ruler can be used to
measure its length.
The thread method can also be used to measure the diameter of a sphere
by wrapping the thread around the sphere and measuring the length of the
straightened thread.
The SI (Standard International) unit of length is metres (m).
Measuring Volume
An object’s volume is the space it occupies; It is measured in cubic
metres(m3).
For regular objects, volume can simply be calculated by using formulas.
For irregular objects,however, measurements cannot be taken precisely so
we use the finding volume by displacement method.