Question
Define volume. How is it measured?
✓
Answer
Volume is the space occupied by an object. The common apparatus 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. These are mostly made of a transparent body. Measuring cylinders are available in different sizes to measure volumes: 5 mL, 10mb, 25 mL, 50 mL, 100 mL, 250 mL, etc. We can measure up to an accuracy of 0.1 mL. Now proceed as follows:
- Place a clean, dry measuring cylinder on a flat surface.
- Pour liquid slowly into the measuring cylinder.
- The liquid in the cylinder forms a curved surface.
- Read the marks on the measuring cylinder with the bottom of the meniscus for water and other colourless liquids, and the upper meniscus in case of coloured liquids.
- The reading on the cylinder gives the volume of the liquid in mL.
- You can choose a cylinder of any size depending on the amount of liquid to be measured.
Volume of Solids
A. Volume of regular shape solids can be calculated by the following formula:
Volume $=1 \times w \times h = cm ^3$
B. Volume of irregular solids can be measured by the following steps:
- Fill a measuring cylinder up to half its capacity. Record the initial reading. Let it be V1.
- Tie the object, say a stone, with a thread and lower it in the measuring cylinder.
- Record the final reading. Let it be V2.
- Volume of object = (V2 – V1) cm3
- Place a clean, dry measuring cylinder on a flat surface.
- Pour liquid slowly into the measuring cylinder.
- The liquid in the cylinder forms a curved surface.
- Read the marks on the measuring cylinder with the bottom of the meniscus for water and other colourless liquids, and the upper meniscus in case of coloured liquids.
- The reading on the cylinder gives the volume of the liquid in mL.
- You can choose a cylinder of any size depending on the amount of liquid to be measured.
Volume of Solids
A. Volume of regular shape solids can be calculated by the following formula:
Volume $=1 \times w \times h = cm ^3$
B. Volume of irregular solids can be measured by the following steps:
- Fill a measuring cylinder up to half its capacity. Record the initial reading. Let it be V1.
- Tie the object, say a stone, with a thread and lower it in the measuring cylinder.
- Record the final reading. Let it be V2.
- Volume of object = (V2 – V1) cm3
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