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Ch 3.2 Units of Measurement
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Gravity
Covers the 7 SI base units, key measurements such as volume, weight, temperature, density and related calculations
Terms in this set (32)
SI
International System of Units used by most countries for everyday measurement and used by the scientific community worldwide
SI unit for Length
Meter
Symbol used for the SI unit for Length
m ( lowercase m)
Mass
A measure of the amount of matter in an object
Weight
A measure of the force of gravity on the mass of an object
SI unit for Mass
Kilogram
Symbol used for the SI unit for mass
kg (both letters lower case)
SI unit for Temperature
Kelvin
Kelvin scale
the temperature scale in which the freezing point of water is 273 K and the boiling point is 373 K; 0 K is absolute zero
Celsius scale
The temperature scale on which water freezes at 0 degrees and boils at 100 degrees
Symbol used for the SI unit for Temperature
K ( Capitalized K, the degree symbol isn't used)
SI unit for Time
seconds
Symbol used for the SI unit for Time
s ( lowercase)
SI unit for describing the amount of a substance
mole
Symbol used for the SI unit when describing the amount of a substance
mol ( all lowercase with no e on the end)
SI unit for describing Luminous Intensity
candela
Symbol used for the SI unit for describing Luminous Intensity
cd ( lowercase)
SI unit for electric current
ampere
Symbol used for the SI unit used for electric current
A ( capital)
How many meters are in 1 KILOmeter?
1000 m = 1 km
( KILO- = 1000x bigger than m)
How many MILIliters are in 1 Liter?
1000 ml = 1 L
( MILI- = 1000x smaller than L)
How many CENTImeters are in 1 m?
100 cm = 1 m
(CENTI- = 100x smaller than m
How many MICROseconds are in 1 s?
1,000,000 μs = 1 s
(MICRO- = 1,000,000,000x smaller than 1 second)
Volume
the amount of space an object takes up
What are the units used with the Volume measurement of a solid with a ruler?
cm^3
What are the units used when finding the volume through the water displacement method?
ml
Density
Mass per unit volume
What is the equation to find the relationship between an object's mass and volume?
Density = Mass / Volume
What are the units used for the density of a cube?
g/cm^3
A copper penny has a mass of 3.1 g and a volume of .35 cm^3. What is the density of copper?
equation:D=M/V
Answer: 8.9 g/cm^3 ( rounded to 2 sig figs :) )
What density would SINK in water?
More than 1 g/cm^3
What density would float in water?
Less than 1 g/cm^3
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