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What are derived units?
- Units that combine several fundamental units to derive their unity
- example: area= length x length
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In the lab, what do we measure the volume of a solid, liquid, and gas, as?
- solid: cm3
- liquid: mL
- gas: L
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Why is the volume of a gas measured with its measurement and not that of the liquid?
- It deals with the density of water
- 1 mL= 1 cm3Water is more dense at 3.98oC as a liquid. As you get away from the liquid state, the density decreases, making water lighter
- Because gas is not very dense, it is measured in g/L
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Each cubic meter contains __ cubic decimeters, which contain __ cubic centimeters.
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What is accuracy?
how close to a true value a given measurement is
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What is precision?
- how well a number of independent measurements agree with each other
- - How well can you repeat/ receive the same value?
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What is standard deviation
- amount of precision
- the higher it is, the less precise your answer
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What should we pay attention to when doing measurements?
significant figures
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Does it matter what we measure with?
Yes
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density
mass per unit volume
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speed
distance per unit time
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acceleration
change in speed per unit time
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force
mass x acceleration
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pressure
force per unit area
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