No measuring cylinder, only balance (including weight), beaker (without scale), water, milk, rubber band and rag. Design the experiment, measure the density of milk and write the steps.

1. Use the adjusted balance to weigh the mass of the small beaker m 1

2. Inject a proper amount of water into the beaker, measure the height of the water surface with a scale as h 1, and weigh the total mass m2 of the beaker and water with a balance.

3. Empty the water in the beaker, inject a proper amount of milk, measure the height of milk with a scale as h 1, and weigh the total mass m3 of beaker and milk with a balance.

4. Calculate according to: (m3-m 1)ρ water /(m2-m 1).

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