Measurement Why Accuracy is Important

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History of Measurement History of Measurement for Kids

Variables that we directly measure

Length Measured with a ruler in metric or English (meters, feet, …) Football Hockey

Dressage Arena

Micrometer Instrument that measure very small lengths

Snowboards are measured in cm’s

Laser light Measured in wavelengths (nanometers and micrometers)

Mass – how much matter something is made of (Measured in grams and kilograms on a triple beam balance)

Time Units are seconds, minutes, hours, …

Temperature (Measured in degrees Celsius, Fahrenheit, or Kelvins with a thermometer

Weight- is the measure of the force of gravity on an object Units are ounces, pounds, grams

Measurements that we derive from other measurements

Volume Solids and Liquids X

Liquid volumes are measured directly with a variety of containers Beaker Graduated Cylinder Measuring cups ml ounces

Other units for measurement you will use this year Force is in Newtons (kg m/s²) Energy is in Joules (kg m²/s²) Momentum is in kg m/s Density is in g/cm³ or g/ml Speed is in m/s Acceleration is in m/s² Hertz (frequency) waves/s

Other weird measurement units

Altimeter- measures elevation using air pressure changes Flying a plane

Air Pressure Units inches of Hg (Mercury)

Blood Pressure Cuff Measured in mm of Hg (Mercury)

NIST National Institute of Standards and Technology Typical NIST headline Atomic ClockAtomic Clock/