Q&A for How to Find the Density of Water

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How does ice have less density than water?

Donagan

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Near the freezing point, water actually expands as it cools, making it less dense.

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How I can find the density of marbles in water?

Donagan

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Find the volume of the marbles (by water displacement), weigh the marbles, and divide their weight by their volume.

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How can I control the density of water?

Community Answer

You can add different solvents to change the density. For example, dissolving salt will increase the density.

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How would my calculated density values be affected if I misread the volume measurement on the graduated cylinder?

Community Answer

The volume measurement is being divided by the mass, so the density would be different from what it really is supposed to be.

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Why is the density of the water the same as the volume?

Donagan

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It isn't. Density is mass per volume, essentially the weight of the water that fills a given space. It happens that in the metric system one gram of water fills one milliliter of space, but that one-to-one relationship does not exist in other measurement systems.

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Which is higher, petrol or oil?

Donagan

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The average motor (engine) oil is about 30% denser than petrol/gasoline.

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How do I measure the density of a fish pond?

Donagan

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Follow the instructions above. Expect the density to be higher than it is with cleaner water.

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Question

What principle was used?

Donagan

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Density is simply weight per volume. You collect a known volume of water and weigh it.

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How do I calculate density relative to temperature?

Donagan

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Temperature does affect density to a small extent. In the case of water, it does expand if it freezes, and it will evaporate if it boils, in either case changing the density. All you can do is measure instantaneous volume and weight at a given temperature. In the case of boiling water, measuring precise volume is difficult.

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How does the density of a liquid vary with the temperature?

Donagan

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Generally speaking, the density of a liquid (and most other matter) varies inversely with temperature.

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A piece of ice block 50g was dropped in a measuring cylinder. The level of the water was increased from 40cm³ to 65cm³. Find the density of the water.

Community Answer

Density = mass of volume. Mass = 50g. Volume = (65 - 40)cm^3 = 25cm. Therefore, Density = 50g/25cm^3 = 2g/cm^3.

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Question

Let's say I didn't subtract the weight of the graduated cylinder. Would I still be able to find the density?

Verin

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No, because you'd essentially be finding the average density of both the water and the graduated cylinder combined, as opposed to just the density of the water.

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