Page 120 - Innovator's Science-8

mass stays constant. Most common
balances measure weight but show the

reading as mass because on Earth, the Hook
gravity is almost constant. So, when you
weigh something, you usually see its mass, Pan Pan
but technically, you're measuring the force
Pointer
of gravity on it.
Two-pan balance
How to Measure Volume?
The label on the tetra pack shows that the amount of buttermilk inside is
200 mL. You learnt that the volume of any object is the measurement of the

space it uses. You also know that the SI unit of volume is cubic metres,
3
written as m . It is the volume of a cube whose each side is one metre in
length. Volume of smaller objects is conveniently expressed in a decimetre
3
3
cube (dm ) or centimetre cube (cm ). One centimetre cube is also written
as one 1. Volume of liquids is expressed in litres (L) which is equivalent to 1
3
dm . A commonly used submultiple of a litre is millilitre (mL) which is
3
equivalent to 1 cm . One of the common apparatuses used to measure the
volume of liquids is a measuring cylinder. It is a narrow transparent

cylindrical container with one side open and the other side closed as shown
here. There are markings on the
transparent body of the cylinder that
indicate the volume of liquid in the

measuring cylinder. We can use it to
measure the desired amount of a liquid.
Measuring cylinders are available in
different sizes to measure volume— 5

mL, 10 mL, 25 mL, 50 mL, 100 mL, 250
A pack of buttermilk mL, etc. How accurately can these
of 200 mL measuring cylinders measure? Measuring cylinders of different capacities

TEMPERATURE AND ITS MEASUREMENT

You learned how to use a thermometer and understand its smallest
reading. Similarly, a measuring cylinder is a tool used to measure the

volume of liquids accurately. When you take a measuring cylinder and look
closely, you will see marked lines called graduations along its length. These
lines help you measure how much liquid is inside. To get the correct
reading, place the measuring cylinder on a flat surface, look at the liquid

level at your eye level, and read the volume at the bottom of the curved

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