the metric system the scientific system of measurement the international system of units (si) based...
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The Metric System
• The scientific system of measurement
• The International System of Units (SI)
• Based on the number 10 and multiples of 10
Length
• Distance between two points• Meter (m) = basic unit of length
= 39.4 inches• Metric rulers and meter sticks
used to measure
Meter stick -- 1 meter or 100 cm or 1000 mm long
Metric ruler -- 30 cm or 300 mm long
Volume
• The amount of space an object takes up
• Liter = the basic unit of volume (L)
• Cubic Centimeter (cc or cm3) – used to measure the volume of solids
1 ml = 1 cc = 1 cm3
1000 ml = 1 L
• Liquid: Measured with graduated cylinder
Meniscus -- the curved surface of a liquid in a graduated cylinder. Read the bottom of the meniscus.
• Irregular solid: Measure out some water
in the cylinder. This is volume 1. Drop the solid into the liquid causing the water level to go up. This is volume 2. Subtract volume 1 from volume 2 to get the volume of the solid.
• Solid: volume = length x width x
height
Mass
• The measure of the amount of matter in an object
• Kilogram (kg) = basic unit of mass
• Measured with balance
Density
• The mass per unit volume of a substance
• Density = MassVolume
• Density of water = 1 g/mL
• Objects with density less than 1 g/mL float on water.
• Objects with density more than 1 g/mL sink in water.
Temperature • Celsius scale is usual
measurement but SI unit is Kelvin• The Kelvin temperature can be
found by adding 273 to the Celsius reading
Water freezes at 0oC Water boils at 100oCBody temperature = 37oCRoom Temperature = 21oC
• Temperature is measured with a thermometer
Time
• The interval between two events• Measured in seconds
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