1 / 16

Metric System

Metric System. International System of Units (SI). The Language of Measurement. Standard : an exact quantity against which comparisons can be made (any number) Unit : a label that follows the measurement to give it value (meter, liter)

wynter-castro
Download Presentation

Metric System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Metric System International System of Units (SI)

  2. The Language of Measurement • Standard: an exact quantity against which comparisons can be made (any number) • Unit: a label that follows the measurement to give it value (meter, liter) • Standard of comparison: comparing the size of an object with that of a known standard. (2 liters, 10 meters, 5 grams)

  3. Science Uses Metric Units • World scientists use the International System of Units (SI) because it uses less units and is convenient and universal. Metric Units Celsius & Kelvin Temperature Meter Gram Newton Second Liter Liquid Volume Length Force/Weight Mass Time

  4. Matter • Everything is made of matter • All matter has properties that can be observed and described Physical Properties Chemical Properties Color Hardness One way to observe physical properties is to measure them! Shape

  5. LENGTH • Measured using a meter ruler or meter stick • Basic unit for length:meter - m Length - 26 cm

  6. AREA • Standard SI Unit–square meter - m² • Formula: Area equals length times width: A = l x w Length – 8 cm AREA Width 3 cm Area: 8 x 3 = 24cm²

  7. VOLUME • Standard SI Unit – cubic meter - m³ • Volume equals length times width times height: V = l x w x h Volume: 10 x 5 x 3 = 150 m³ Height: 3 m Length – 10 m Width = 5 m

  8. LIQUID VOLUME Usually measured in Liters (L) Tools: Beakers Graduated Cylinder

  9. MASS • Amount of matter in an object • Standard SI Unit: kilogram and gram Tool:Triple Beam Balance

  10. DENSITY D = M/V means Mass divided by Volume • Amount of mass a material has for its volume • Often compared with the density of water • less dense: float • more dense: sink • Frozen water expands • and becomes less dense = • floating ice cubes

  11. FORCE • A push or pull on an object • Weight is the measure of the force of gravity acting on an object • Strength depends on the mass of the object and the distance between them • SI Unit: Newtons (N) • Weight measured on a spring scale

  12. TEMPERATURE • Measured using a thermometer 2 scales used in science Celsius (C) Kelvin (K) Note: The Fahrenheit temperature scale still used in U.S. weather forecasts.

  13. TIME • A measurement of the period between two events. • Not a property of matter • SI Unit: Second • In one second, light can travel about 7 ½ times around the earth at the Equator. Speed of light: 186,300 per second • Most accurate: atomic clock at the National Bureau of Standards in Washington, DC

  14. “WHY DO I NEED TO KNOW THE METRIC SYSTEM?” All countries in the world use the Metric System… except Burma (Myanmar) and the United States National Bureau of Standards in Washington, DC sets accurate measurement standards for science, industry and commerce Industries that sell or buy goods in other countries must use SI units to compete in those countries.

  15. Accuracy, Estimation, and Precision • ACCURACY: depends on how close your value is to the actual or accepted value • ESTIMATION: a valuable skill that saves time! • It can be improved with practice. • PRECISION: the degree of exactness with which the object is measured. • Depends on the measuring instrument. • Can’t improve with practice. • Can only be as precise as the measurement instrument. • Does not guarantee accuracy!

  16. LET'S MEASURE SOMETHING!

More Related