# Measurement - PowerPoint PPT Presentation

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Measurement. The International System of Units ( SI ) is the standard system used around the world. Length. The standard SI unit to measure length is the meter (m). The meter is divided into 100 equal parts called centimeters (cm).

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Measurement

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## Measurement

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

### Length

• 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

• 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

• 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

• 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

• 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)

### Measurement

• 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

• 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.