imperial system metric system - mr. martin´s · si units imperial system metric system length...

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SI Units

Imperial System Metric System

Length inches, feet, miles cm, meters, kilometers

Volume fluid ounces, pints, quarts, gallons mL, liters, kL

Mass ounces, pounds grams, kilograms

Temperature Fahrenheit Celsius

Velocity mph kph

Metric System Chart

Metric System Chart

Metric System Chart

Meniscus = the curve of water in a graduated cylinder,

always read from the bottom

________

°C

1.

2.

3.

Practice reading these measurements:

Accuracy◦ How close a measured value is to a true value

Precision◦ How close measured values are to each other

◦ The more decimal points, the more precise a tool is

⚫2.34 grams vs. 2.3 grams

Low Accuracy

High Precision

High Accuracy

Low Precision

High Accuracy

High Precision

Accuracy Examples:• Boiling point of water is 100⁰C but the thermometer

reads 99⁰C• The recipe calls for ¾ cup of sugar but your sister accidentally

measures out ⅞ cup of sugarPrecision Examples:• Mr. McCutcheon says he has about 100 students but Mr.

Harabin knows that he only has 89• Jimmy measured the ounces of gold he had at about 10 but

Pauly knew that he had exactly 12.35

EXAMPLES:

Remember to count the movement of the decimal point and that becomes the exponent…. Left = + …. Right = -

Example 112,340 1.234

x 10⁴

Example 210,456,000 1.0456 x 10⁷

Example 30.00045 4.5 x

10-⁴

Density

Density