Transcript Standards of Measurement PowerPoint

Chapter 1: The Nature of Science
 Name the prefixes used in SI and
indicate what multiple of ten each one
represents.
 Identify SI units and symbols.
 Convert related SI units.

Standard: exact quantity that people
agree to use for comparison.

Imperial system of measurement
 Feet
 Pounds
 Gallons

Only 3 countries do not use the metric
system of measurement:
 U.S.A., Myanmar, and Liberia
 International System of Units (SI): an
improved version of the metric system.
 Understood by scientists worldwide
 Based on multiples of 10 and uses prefixes
to indicate a specific multiple.

SI Base Units:
 Length – meters (m)
 Mass – grams (g)
 Liquid volume – liters (L)
 Time – seconds (s)

SI Prefixes:
 Kilo (k) – x1000
 Centi (c) – x 0.01 or 1/100
 Milli (m) – x 0.001 or 1/1000
See the “Metric Toolbox” or Page 15 of your
textbook for more
 Converting between SI Units:
 Use conversion factors:
▪ ratios that are used to change one unit to
another
 There are 1000 mL in 1 L.
 How many mL are in 3 L?
1.
2.
3.
4.
5.
Write what you know on the left
Write what you want on the right
Put a conversion factor in the middle
Cancel units on top and bottom
Multiply top and divide bottom
 There are 100 cm in 1 m.
 How many cm are in 2.75 m?
 How long, in centimeters, is a 3,075
mm rope?
 Length is measured using a unit
appropriate for the distance between
two points.
 The SI unit of length is the meter (m).
mm
cm
 Volume: the amount of
space an object occupies.
 The base unit for liquid
volume is liters (L)
 Beakers, flasks, and
graduated cylinders (mL)
 Measuring solid volumes:
 Formulas: (V = l x w x h)
▪ Units in cubic centimeters (cm3) or cubic
meters (m3)
 Water displacement
 Mass: a measurement of
the quantity of matter in
an object.
 Base unit is grams (g)
 Balances can be used to
measure mass

Density: the mass per unit volume of a
material.
 How much mass an object has in a certain
amount of space.
 Density = mass/volume
 Unit for density is grams per milliliter (g/mL)
 SI unit of time = seconds (s)
 Metric unit of temperature = degrees
Celsius (°C)
 SI unit of temperature = Kelvin (K)