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SI Units & Scientific Notation

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 .

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SI Units & Scientific Notation

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  1. SI Units & Scientific Notation Miss Witkowski

  2. 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.

  3. 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

  4. 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)

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

  6. 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

  7. 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

  8. Terminology • The number 273,000,000,000 in scientific notation is written as : Base 2.73 x 1011 Exponent Coefficient

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