measurement a way to describe the world with numbers
TRANSCRIPT
Measurement
• A way to describe the world with numbers.
Measurement• Can answer:• How much, how long, or how far?
Everyday Measurements
Tools of Measurement
• Stopwatches
• Meter-sticks
• Balances
• Thermometers
Metric System
International System (SI)
• The SI system is the accepted system of measurement.
• Units are in multiples of 10.
Which of these do not belong in the metric system?
Metric System
• We use these prefixes the most:• kilo• centi• milli
kilo hecto deca
Base unit
meter
gram
liter
deci centi milli
1000 100 10 1 .1 .01 .001
Converting Units
Length
• Meter is basic unit.
Length
• 1000 meters = kilometer
Length
Length• Use a centimeter to measure the
length of a pencil.
Length
• 1 inch = 2.54 cm
Length
• 100 centimeters in a meter.
Length
• 1000 millimeters in a meter.
Converting Units Length
Mass• Amount of matter in
an object.
• More matter = more mass.
• Kilogram (kg) is used for large objects.
• Gram (g) for small objects.
Triple Beam Balance
Electronic Balance
Mass• Mass is the same no matter where in
the universe the object is located.• Weight = pull of gravity.
Converting Units: Mass
Weight
• Gravity exerts force on an object.
• More mass = greater weight
• Weight changes depending on location.
• Unit = newtons (N)
Weight
• A brick & sponge have the same volume.
• Brick has more mass so, it weighs more.
Weight
Volume
• Amount of space something occupies.
• L x W x H
Volume
Height of box = 2Width = 3Length = 62 x 3 x 6 = 3636 cubes like the red one would take up the same amount of space as this box.
Volume of Solids
• Unit is meters cubed• cm3
• L X W x H
Liquid Volume
• Liters & milliliters are the units.
• Meniscus is the curve at the surface of a liquid.
• Read at lowest point.
Volume of Irregular Shaped Solids
• Use water displacement.
• liters or mL rather than cm3
Converting Units Volume
Converting Units (Volume)• 45 mL = 4.5 centiliters cL)• 45 mL = .45 deciliters (dL)• 45 mL = 0.045 liters (L)• 45 mL = 0.0045 dekaliters (dkL)• 45 mL = 0.00045 hectoliters (hL)• 45 mL = 0.000045 kiloliters (kL)
kilo hecto deca
Base unit
meter
gram
liter
deci centi milli
Temperature
• How hot or cold a substance is.
• We use degrees Celsius ºC.
Temperature
• Water freezes at 0º C.
• Water boils at 100º C
Measuring Temperature
Density
• Amount of matter in a given volume.
• measure mass & volume of an object to find density.
• Unit = g/mL3
Density