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Why can't you use fluid ounces and pounds interchangably?

Updated: 8/17/2019
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15y ago

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Fluid ounces is a measurement of volume and pounds are a measurement of weight.

It isn't possible to use fluid ounces and pounds interchangeably because different liquids have different densities. Meaning that 100 fluid ounces of water doesn't weigh the same as 100 fluid ounces of vegetable oil.

You can test this by pouring a little vegetable oil into a small glass of water. The oil "floats" to the top because it is not as dense as water.

Here is another interesting fact: liquids have different volumes depending on the temperature of the liquid. A glass of water at 36 degrees Fahrenheit has a different volume than the same glass of water where the water is 100 degrees Fahrenheit.

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Q: Why can't you use fluid ounces and pounds interchangably?
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