SI Units and Standards of Measurement Mr. Haase

Standards of Measurement Exact quantity used to compare measurements U.S. uses English & metric standards Most other nations . . . all metric system English Vs. Metric System Yards vs. Meters Gallons vs. Liters Pounds vs. Grams Miles vs. Kilometers Fahrenheit vs. Celsius

Metric System SI System System International or Metric System Accepted by scientist throughout the world Uses a base unit with prefixes Based on units of 10

Metric System Base Units Meter Liters Gram Second Celsius/Kelvin measures temp

Metric Prefixes Metric Prefixes Use prefixes with base units Kilo = 1000 Hecto = 100 Deca = 10 Base Units (g, L & m) = 1 Deci = 1/10 or 0.1 Centi = 1/100 or 0.01 Milli = 1/1000 or 0.001

Metric Prefixes

Length Length Distance between two points Metric base unit is the meter

Volume Volume Amount of space occupied by an object Metric base unit is Liter Volume of a solid is measured with unit of length Length x Width X Height L(1) x L(2) x L(3) cm³

Volume Volume of a liquid Volume of a solid Use graduated cylinders for precise volume Volume of a solid Use ruler or meter stick to measure 3 dimensions

Mass Mass Amount of matter in an object Metric base unit is the gram

Density Density The mass per unit volume of an object Density equals mass of an object divided by the volume D = m/v Unit for density is g/cm³ OR g/mL Density < 1 object floats Density > 1 object sinks

Time and Temperature Time Temperature Interval between two events Unit of measurement is seconds Temperature How hot or cold something is Unit of measurement is °Celsius or °Kelvin

Temperature Conversions Temp Conversions Water boils at 100° C and 212° F Water freezes at 0° C and 32°F C = (F – 32) x .56 F = (C x 1.8) + 32

Example Problems Find the volume of a box that has a length of 2.3 mm, height of 3.4 mm and a width of 2.1 mm. 2. Find the width of a container that has a volume of 120 cm³, length of 10 cm and height of 5 cm. 3. Find the density of an object that has a mass of 2.1 mg and volume of 9.2 mm³. 4. Find the mass of an object that has a density of 0.78 g/ml and a volume of 16 ml.

Example Problems 1. Convert the following: 97° F to C 12°F to C 45° C to F 97° F to C 12°F to C 65° C to F