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Shortcomings of Volume

Understand the complexities of volume changes during solid dissolution and gas compression, and the importance of mass measurement tools like electronic balances. Learn how to use standard units like grams and kilograms effectively in educational settings.

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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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