Estimate & Measure Mass (g & kg)
Mass is the amount of matter in an object (how heavy something is).
Gram (g): Used for light objects (for example: 1 paperclip = 1 g, 1 apple = 150 g).
Kilogram (kg): Used for heavy objects (for example: 1 textbook = 1 kg, 1 bicycle = 12 kg).
Key Fact: 1 Kilogram (kg) = 1,000 Grams (g)