American / English units Scientific / International / 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

Practice reading these measurements: 1. 2. 3. ________ °C

High Accuracy High Precision 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: Precision 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 sugar Precision 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 1 12,340 1.234 x 10⁴ Example 2 10,456,000 1.0456 x 10⁷ Example 3 0.00045 4.5 x 10-⁴

Density

Density