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Measurement

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Measurement

The International System of Units (SI) is the standard system used around the world.

- The standard SI unit to measure length is the meter (m).
- The meter is divided into 100 equal parts called centimeters (cm).
- The centimeter is divided into 10 equal parts called millimeters (mm).
- Long distances are measured in kilometers (km) which is 1,000 m.

- Mass is the amount of matter that something is made of.
- The kilogram is the SI unit to measure mass.
- Mass is measured with a triple balance beam.
- Unlike weight, mass does not change with an object’s position.

- Weight is a measurement of the gravitational force on an object.
- The SI unit for force is the Newton (N).
- Since weight is a measure of gravitational force, it does matter where you are.
- There is 6 times less gravitational force on the moon, so you would weight 6 times less there.
- Use spring scales to measure weight.

- Density is mass per unit volume.
- Density is the amount of matter it has in a given space.
- To find density (D), first measure the mass (m) and volume (V), then divide mass by volume.
- Density is an SI derived unit (mass and volume)

- Volume is the amount of space that something occupies.
- Volumes of liquids are expressed as liters (L).
- Graduated cylinders are used to measure liquid volume, and also to find the volume of a small odd shaped object. (see meniscus)
- Volumes of solid objects are expressed in cubic meters (cm3)

- Area is the amount of surface included within a set of boundaries and is expressed in square such as square meters (m2).
- The amount of space occupied by an object is the object’s volume.

Area and Volume

- The basic SI unit of volume for a solid object is the cubic meter (m3).
- SI measurements for liquid volumes are in milliliters (mL) or liters (L).

- Temperature is a measure of the average kinetic energy of the particles in an object.
- Temperature is not determined by how much of the substance you have.
- The SI unit for temperature is Kelvin (K), however the Celsius (C) scale is most commonly used.