Page 56 - ICSE Chemistry 6

• Again mark the level of water in the glass tumbler.
• Compare the two marks.
Observa on: You will observe that the sand se les down and the level of water increases.

Conclusion: The sand added into the glass tumbler occupies some space. Therefore, the level of water
increases. This shows that ma er occupies space.

Differences between Mass and Weight

Let’s study the diff erences between mass and weight as shown in Table 3.1.

Table 3.1: Diff erences between Mass and Weight
Mass Weight

• It is the quantity of matter. • It is the amount of force of gravity acting on the mass.
• It is constant everywhere. • It varies from place to place.

• It cannot be zero. • It can be zero if no gravity acts on the object as in outer space.

It is also important to note that ma er off ers resistance. For example, when you try to cycle against the
direc on of wind or try to swim in fast-fl owing water, you experience resistance. Hence, we can say that
resistance is a force that tends to oppose mo on.
Activity 3.6

Aim: To show that ma er off ers resistance

Materials required: A plas c bo le, a balloon

Procedure
• Take an empty plas c bo le, push a defl ated balloon into it and stretch the open end of
the balloon over the mouth of the bo le.
• Try to infl ate the balloon.

Observa on: The balloon does not infl ate. This is because air occupies the space inside the
bo le and there is no space le for the balloon to be infl ated.
Conclusion: This proves that although air cannot be seen, yet it occupies space and off ers resistance.

Take a Break!

Fill in the blanks.
1. Everything in the __________ is composed of ma er.
2. Ma er exists in both __________ and __________ states.

3. __________ is the measure of quan ty of ma er contained in a substance.
4. Ma er has __________ and occupies __________.

42