Measurement
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Transcript of Measurement
Length
• Distance or size in one dimension.• In the US we use feet, inches and Miles• The metric equivalent is Meters
• 1 M = 3.28 feet• 1KM = .62 Miles
• The diameter of a CD or DVD is 12 cm.• A doorknob is typically about 1 m high.
Mass
• Mass is a measure of matter. Often confused with weight.
• Weight = Mass X Gravity.• On earth Mass = Weight• If you go to the moon your mass does not
change but you weight does, because gravity is different.
• 100 lbs = 45.4 Kg
1 ml of water weighs 1 gram. 1 liter of water weighs 1 kilogram, so 1 cubic meter — 1000 liters — of water weighs 1000 kilograms or 1 metric ton.
A US penny weighs exactly 2.5 g, while the nickel weighs exactly 5 g.
Area
• Size in two dimensions
• 1 square inch is = 6.45 Square cm (cm2)
• An 8.5” X 11” page is 603 cm2 8.5 inches
11 in
ches 602 cm2
Volume
• Measures size in 3 dimensions or how much space an object takes up.
• 1 ml = 1 cubic centimeter (cc)
• A graduated cylinder is used to measure volume.
• Always read at bottom of the meniscus
Density
• How much matter is contained in a certain volume
• = mass / volume
• If 1 ml of water weighs 1 gram, what is the density of water?
Density
• How much matter is contained in a certain volume
• = mass / volume
• If 1 ml of water weighs 1 gram, what is the density of water?
• 1 g/ml
• If something is more dense than water it sinks… if it is less dense than water…
Metric ladder
As you move up the ladder, move the decimal place to the left for each step up .As you move down the ladder, move the decimal to the right for each step down.