# Concept of mass and weight

### Mass versus Weight:

Mass and weight aren't the same thing. Mass is considered as one of the attributes of matter. This is true because matter is defined as anything that has mass and occupy space.

From the above introduction, we can conclude that matter has two main attributes or characteristics. These are:

#### 1. Mass:

Mass is the amount of matter a body or anything has. Think of it as the entire composition of anything.

For instance, everything you are composed of (from the top of your hair to your toe nails, including your cells, tissues, organs and systems) will account for your mass. For this reason, your mass will be significantly different from that of a newly born child.

#### 2. Space:

Matter will always take up space no matter how small it is. This is true because some instances of matter can be microscopic. Examples of microscopic forms of matter include bacteria, protists and viruses.

Note: A space completely void of matter is referred to as a vacuum. A vacuum environment barely exist naturally, rather they are prepared for medical and scientific reasons.

### Concept of Mass and Weight

Mass is the amount of matter in anything and it will always remain constant (the same) for that specific thing all over the universe. Consider the instance below:

Let's assume that one mole of copper has a mass 100g. If you travelled with this copper (one mole) to another country or to the moon or to planet jupiter, it will always have that same mass of 100g. This is true because it's the same amount of copper (one mole).

The above instance is true because pure copper will always have the (exact) same type of atomic composition (and that's copper atoms).

It is noteworthy to state that gravitational force will always act on mass. In fact, it is the action of gravity on the mass of a body that gives rise to weight. You can therefore think of weight as 'gravity acting on mass'.

Below is an image that show the concept of mass and weight:

Weight is a function of gravity. This means that gravity accounts for our weight.

Weight can be defined as the force exerted on a body by gravity. Think of gravity as the force that pull things downwards.

In comparison, one mole of copper will have different weights on the moon, earth and planet jupiter respectively. This is so because the moon and planets have got different gravitational pull acting upon them.

Jupiter has a stronger gravitational force than earth. Similarly, earth has a stronger gravity than the moon. This is a fact because: 'the bigger a body, the larger its force of gravity'.

• Jupiter is bigger than earth. In fact it is the largest planet in the solar system.
• Similarly, the earth is bigger than the moon. (The moon is earth's natural satellite).

Based on the above explanations, one mole of copper will weigh more in jupiter and least on the moon. However, it's mass will always remain constant (the same) regardless the location.