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SI Units & Scientific NotationPowerPoint Presentation

SI Units & Scientific Notation

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### SI Units & Scientific Notation

Miss Witkowski

What is the SI System?

- All systems of weights and measures, metric and non-metric, are linked through a network known as the International System of Units.
- The International System is called the SI, using the first two initials of its French name Système Internationald'Unités.

Why do we use it?

- This system is used because the scientific world is international
- It allows an easier way of communicating internationally and makes converting problems less complicated

Base/Standard Units

- You typically use the following units when referring to a particular measurement
- Length: meter (m)
- Mass: kilogram (kg) (amount of matter)
- Weight:Newton (measure of gravitational force)
- Time: seconds (s) or minutes
- Temperature: Celsius (C)/ Kelvin(K)
- Area: square meter (m2)
- Volume: cubic meter (m3) and liter (L) (1 m3 = 1000 L)
- Density: kilogram per cubic meter (kg/m3) or gram per mL (g/mL) (1000 kg/m3 = 1 g/mL)

Scientific Notation

- This is a shorter method to express very large numbers
- Scientific Notation is based on powers of the base number 10

How To Write a Number in Scientific Notation:

- Put the decimal after the first digit and drop the zeroes(must be between 1 and 9)
123,000,000,000 Becomes 1.23

- To find the exponent count the number of places from the decimal to the end of the number.
- In 123,000,000,000 there are 11 places. Therefore we write 123,000,000,000 as: 1.23 x 1011

Positive and Negative Exponents

- If a decimal is moved to the left (became smaller), the exponent is positive
- 34,000,000,000,000= 3.4 x 1013

- If a decimal is moved to the right (became larger), the exponent is negative
- 0.000000000294 = 2.94 x 10-10

Terminology

- The number 273,000,000,000 in scientific notation is written as :
Base

2.73 x 1011 Exponent

Coefficient

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