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Shortcomings of Volume

Shortcomings of Volume. When a solid dissolves in a liquid, sometimes the volume changes (decreases) Gas is easily compressed (lots of gas can be shoved into the same space-like pumping a bike tire) Difficulty in comparing differences between a solid and a liquid, or a liquid and a gas. Mass.

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Shortcomings of Volume

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  1. Shortcomings of Volume • When a solid dissolves in a liquid, sometimes the volume changes (decreases) • Gas is easily compressed (lots of gas can be shoved into the same space-like pumping a bike tire) • Difficulty in comparing differences between a solid and a liquid, or a liquid and a gas.

  2. Mass • Mass has been used as a measurement tool for thousands of years… • Equal arm balances were used early on-people quickly realized they responded to MASS. The type of mass did not matter • A standard mass is necessary in order to compare different types of objects • Grams are the standard unit for mass • 1 kilogram = 1000 grams (1 kg=1000g)

  3. Electronic Balances • Pan moves slightly when object put on it • The tare button puts the number (mass) on the screen back to zero. • Be careful to make sure the units listed along the edge of the screen are the ones that you are measuring. Ask your teacher for assistance with this feature.

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