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# SI Units & Scientific Notation PowerPoint PPT Presentation

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 .

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