Measurement

1
Measurement

• The metric system

2
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.

3
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.
4
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 inches
602 cm2
5
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

6
Volume of regular objects can be calculated from
a few measurements
7
Volume

• How do you measure the volume of an irregular
  object?

8
Volume

• How do you measure the volume of an irregular
  object?

Displacement!
9
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?

10
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

11
It Floats!
12
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.
13
Quiz

• Triple beam balance is used to measure
• A graduated cylinder is
  used to measure
• What is the mass of a ml of water?
• What is the density of water?