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The SI System of MeasurementPowerPoint Presentation

The SI System of Measurement

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Objectives

- Identify the base units for the SI System
- Understand how and when to use derived units.
- Identify the differences between mass and weight.

- Le Système International d’Unités (SI)
- Meter
- Kilogram
- Kelvin
- Second
- Derived Unit

The SI System

- Le Système International d’Unités (SI) is a modern version of the metric system based on a decimal system.
- In 1960, the SI System was a revision of the meter/kilogram/second version of the Metric System.
- The system has been nearly globally adopted. Three principal exceptions are Burma (Myanmar), Liberia, and the United States.
- The United Kingdom has officially adopted the International System of Units but not with the intention of replacing customary measures entirely.

The SI System

- Length
- The SI unit for length is the meter (m).

- Mass
- The amount of matter in an object is called mass.
- The SI unit of mass is the kilogram (kg).

- Weight
- Weight is a measure of the gravitational force on an object.
- The SI unit for force is the newton (N).

- Time
- Time is the interval between two events.
- The SI unit for time is the second (s).

- Temperature
- Temperature is a measure of the average kinetic energy of the particles that make up a material.
- The SI unit for temperature is the kelvin (K).
- Absolute zero is the coldest possible temperature.

Kelvin Temperature

Although Kelvin is the SI unit, in practice we will use the Celsius Scale

Derived Units

- Area
- Area is the amount of surface included within a set of boundaries.
- The SI unit for area is square meters (m2).

- Volume
- Volume is the amount of space occupied by an object.
- The SI unit for volume is cubic meters (m3).

- Density
- Density is the measure of the amount of matter that occupies a given space.
- The SI units for density areexpressed in grams per cubic centimeter (g/cm3), grams per milliliter (g/mL), and kilograms per cubic meter (kg/m3).

Derived Units

- Other units in the SI are derived (made) by combining units:

Larger/Smaller Units

- The SI system uses prefixes on the base units to make the unit larger or smaller:

Practice

What unit would you use to:

- measure the distance from your house to the school?
- determine your mass?
- measure the length of 5th Block?
- if you were preparing a weather report?
- measure the mass of a paper clip?

Practice (cont.)

What unit would you use if you were:

- measuring the thickness of your pencil/pen?
- measuring the mass of a penny?
- writing a density?
- measuring the volume of this room?
- measuring the area of the football field?

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