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Imagine holding a tiny paperclip in one hand and a big, heavy watermelon in the other.
Mass is the word scientists use to tell us how heavy something is.
When we want to measure something super light, which unit should we use?

Measuring Light Things with Grams

We use grams (written as g) to measure small, light objects.
One small paperclip has a mass of about 1 g1\text{ g}, and a single grape has a mass of about 5 g5\text{ g}.
What happens when an object is much too heavy to count in tiny single grams?

Measuring Heavy Things with Kilograms

We use kilograms (written as kg) to measure heavier objects.
It takes 1,0001{,}000 grams to make just 11 kilogram, which is about the mass of a full bag of sugar or a large bottle of water.