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**SI Units and Standards of Measurement**

Mr. Haase

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**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

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**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

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**Metric System Base Units**

Meter Liters Gram Second Celsius/Kelvin measures temp

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**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

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Metric Prefixes

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**Length Length Distance between two points**

Metric base unit is the meter

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**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

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**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

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

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**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

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**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

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**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)

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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.

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**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

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The Metric System The scientific system of measurement

The Metric System The scientific system of measurement

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