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Units of Measuring

Units of Measuring. A Guide to the System of International Scientific Measurements. In class we will always use SI units. SI stands for Systeme International d’ Unites. There are many different SI units. For example: Volts (electrical pressure) Amps (electrical current)

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Units of Measuring

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  1. Units of Measuring A Guide to the System of International Scientific Measurements

  2. In class we will always use SI units. SI stands for Systeme International d’ Unites. There are many different SI units. For example: Volts (electrical pressure) Amps (electrical current) Watts (electrical power) Calories (heat) Newtons (force) In class we will mainly use four SI units. Meter (length) (cm) Gram (mass) (g) Liter (fluid volume) (mL) Degree Celsius or Kelvin (temperature) (oC) Each unit can be subdivided by common prefixes…check this out… Basic Units

  3. giga- 1 000 000 000 mega- 1 000 000 kilo- 1000 hecto- 100 deka- 10 - -- - deci- .1 centi-.01 milli-.001 micro- .000 001 nano- .000 000 001 Metric Prefixes What is a byte? a megabyte? a gigabyte? a nanobyte?

  4. Linear Measurement • The meter is the basis of the metric system, and it is the unit used to measure the distance between two points, or what we call length, width or height. • A meter is technically one ten-millionth of the length of the earth's meridian along a quadrant (one fourth the circumference of the earth). • The meter was intended to equal 10-7 or one ten-millionth of the length of the meridian through Paris from pole to the equator. • However, the first prototype was short by 0.2 millimeters because researchers miscalculated the flattening of the earth due to its rotation. • Still this length became the standard.

  5. Linear Measurement • The centimeter (cm) is used to measure smaller than one meter distances. • The meter (m) is used to measure floors, fields, and track distances. • The kilometer (km) is used to measure traveled distances.

  6. Volume Measurements • Gases, liquids and solids provide different challenges to measure the space occupied or volume. • Solid measurements are typically measured in cubic meters (m3)or cubic centimeters (cm3) or (cc) • Gases and liquids are usually measure in liters (l), or milliliters (ml) • One ml of water is equivalent to one cm3 of water. • The mass of one ml of water is . . . . .

  7. Mass Measurement • The gram (g) is the basic unit of mass and is equal to the mass of one cubic centimeter or milliliter of water. • The kilogram (kg) is used to measure larger masses. • A balance is used to measure mass.

  8. Mass and Weight • Mass and weight are not the same thing. • Weight is the measurement of gravity on a particular mass. • Mass is a particular amount of matter, but is not dependent on gravity. • You can be weightless, but not “massless.” • You do not weigh the same on the moon, but your mass would be the same. • Gravity can be increased by acceleration on a roller coaster, and so you can weigh more on the ride. • Your mass does not increase as the “G” force increases.

  9. Time Electrical Pressure Charge Electrical Current Electrical Resistance Force Energy Air Pressure Temperature Heat Second (s) Volt (V) Coulomb (C) Ampere (A) Ohm (Omega) Newton (N=m kg/s2) Joule (J) Pascal or millibars O Kelvin or Celsius Calorie Other SI Units

  10. That’s the basics about measuringAny Questions??

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