## What is Mass?

**Mass** is used to measure the weight of an object.

**For example**, you are measuring the mass of your body when you step on to a scale.

**Metric Unit of Mass:** In the metric system of measurement, the most common units of mass are the **gram **and** kilogram.**

**Note: **All of the other metric units of mass are defined in terms of the gram.

### Let’s understand the metric units of mass, what they are in actuality.

#### Kilogram

The abbreviation for **kilogram** is **‘Kg.’**

**1 kilogram **is equal to **1000 grams**.

**1 kilogram** mass is the same as a **Cuban Solenodon, a pineapple. (Approx.)**

#### Gram

The measurement of a gram is one of the most widely used measurements.

The abbreviation for **gram **is **‘’g.”**

**1 gram** quantity is the same as the **weight of a paper clip **or the **weight of a dollar note**.

#### Milligram

A milligram is a **very small unit** of measurement in the metric system,

It also requires very precise scales to weigh out a milligram accurately.

The abbreviation for **milligram **is **‘’mg.”**

**1 milligram** quantity is the same as **a small feather **or** half the weight of a small mosquito**.

### Some basic metric units of capacity and relation between

### Conversion between the metric units of capacity

To convert from one unit of **mass** to another unit, we need to multiply or divide.

**Examples:**

1. **Convert 8 kg into gram and milligram.**

**Solution:** 8 kg = 8 × 1000 g = 8000 g

= 8 kg = 8 × 1000 × 1000 mg = **8,000,000 mg**

2. **Convert 35 g into kilograms.**

**Solution: **35 g = 35/1000 kg

=** 0.035 kg**

3. ** Convert 310 mg into grams.**

**Solution:** 310 mg = 310/1000 g

= **0.31 g**

4. **Convert 12 kg 3 g into kilograms.**

**Solution:** 12 kg 3 g = 12 kg + 3/1000 g

= 12 kg + 0.003 g

= **12.003 kg**

**Example:** Which has the greater mass: 7 kilograms or 6,123,000 milligrams? Explain how you made your comparison.

**Solution:** 7 kg = 7 × 1000 g

= 7000 g = 7000 × 1000 mg

= **7,000,000 mg **

Now it is obvious that 7 kg is greater mass.

**Example:** There are two boxes of cereal in the kitchen. One contains 350 g of cereal, and the other one contains 2.67 kg of cereal. How much cereal (measured in kg) is there in total?

**Solution:** 350 g = 0.35 kg

= 2.67 + 0.35 = 3.02

**There are 3.02 kg of cereal in total.**

### Concept Map

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