To measure magnitude, we need the right instruments. For example, we use a ruler to measure the length of a table, a stopwatch to measure the time it takes a ball to fall, and a thermometer to measure the temperature of water.

The mass of a body is the quantity of matter it contains.

It is measured with scales.

These two terms are often used to mean the same thing, but mass and weight are two different concepts.

The mass of a body is its quantity of matter, while its weight is the force which pulls it towards the Earth, planet or satellite that it is on.

So, the weight of a body on Earth is different to its weight on the Moon, but its mass is always the same.

When we say that an object weighs one kilogram on the Earth’s surface, we mean that it has 1 kg of mass.

The volume of a body is a measurement of the space it occupies.

The way to measure the volume can be different depending on the characteristics of the object.

A measuring cylinder is long and thin. Its scale depends on the size and manufacturer.

When we pour a liquid into a thin tube, it adheres to the sides and forms a curve called the meniscus. In most cases, the meniscus curves downwards.

Measuring cylinders are calibrated so that the volume is read at the lower part of the meniscus. To avoid mistakes, the lines of the measuring scale should be horizontal and our eyes should be at the same level as the meniscus.

Mark the right sentences.

Write the amounts of liquid contained in the following measuring cylinders.

Don’t forget to add the unit.