Free Printable Density Worksheets - Density of Matters - Free Printable

Let's solve this step by step. The task is to circle the best measurement unit (liters, milliliters, grams, or kilograms) for each object based on whether it's measuring volume (how much space something takes up) or weight/mass (how heavy something is).

We’ll go through each item and explain why a particular unit is the most appropriate.

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1. The volume of a bottle of nail polish

- Answer: milliliters
- Explanation: Nail polish bottles are small and contain liquid. A typical bottle holds around 10–15 mL, so milliliters is the correct unit for volume.

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2. The weight of a walnut

- Answer: grams
- Explanation: A walnut is small and light. It weighs about 5–10 grams, so grams is the best unit for mass.

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3. The volume of a bottle of soda

- Answer: liters
- Explanation: A standard soda bottle is 1 liter or 2 liters. This is too large for milliliters (which would be 1000 mL = 1 L), so liters is more practical.

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4. The weight of a duck

- Answer: kilograms
- Explanation: A duck typically weighs several kilograms (e.g., 1–3 kg). Grams would be too small (1000 grams = 1 kg), so kilograms is appropriate.

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5. The volume of water in a fish bowl

- Answer: liters
- Explanation: A fish bowl holds a significant amount of water — usually several liters. Milliliters would be impractical (e.g., 5000 mL = 5 L), so liters is best.

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6. The volume of a dose of cough medicine

- Answer: milliliters
- Explanation: Cough medicine doses are small, like 5 mL or 10 mL. So milliliters is the correct unit for small volumes.

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7. The weight of a paper clip

- Answer: grams
- Explanation: A paper clip is very light — about 1 gram. Kilograms would be too large, so grams is appropriate.

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8. The volume of a tank of gasoline

- Answer: liters
- Explanation: Car gas tanks hold tens or hundreds of liters (e.g., 50 L). Liters is the standard unit for fuel volume.

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9. The weight of an elephant

- Answer: kilograms
- Explanation: Elephants weigh tons — about 3,000 to 6,000 kilograms. Kilograms is the metric unit used here; grams would be too small.

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10. The weight of a feather

- Answer: grams
- Explanation: A single feather is very light — maybe 0.1 to 1 gram. While it might seem tiny, grams is still the best choice because milligrams are not listed as an option (and it’s not that small). But if we must pick from given choices, grams is correct (even though it's less than 1 gram, it's still measured in grams).

> Note: If "milligrams" were an option, that might be better, but since it's not, grams is the best available choice.

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11. The volume of a teaspoon of vanilla

- Answer: milliliters
- Explanation: A teaspoon holds about 5 mL. So milliliters is the correct unit for such a small volume.

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12. The weight of an automobile

- Answer: kilograms
- Explanation: Cars weigh thousands of kilograms (e.g., 1,500 kg). Kilograms is the correct metric unit here.

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✔ Final Answers:

| # | Question | Best Unit |
|---|--------|----------|
| 1 | Volume of nail polish | milliliters |
| 2 | Weight of a walnut | grams |
| 3 | Volume of soda bottle | liters |
| 4 | Weight of a duck | kilograms |
| 5 | Volume of water in fish bowl | liters |
| 6 | Volume of cough medicine dose | milliliters |
| 7 | Weight of a paper clip | grams |
| 8 | Volume of gasoline tank | liters |
| 9 | Weight of an elephant | kilograms |
|10 | Weight of a feather | grams |
|11 | Volume of a teaspoon of vanilla | milliliters |
|12 | Weight of an automobile | kilograms |

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🔍 Summary Tips:

- Use milliliters for small volumes (like liquids in bottles, medicine).
- Use liters for larger volumes (like soda, fish bowls, gas).
- Use grams for small weights (nuts, paper clips, feathers).
- Use kilograms for heavier objects (ducks, elephants, cars).

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