This document discusses measurement standards and the International System of Units (SI). It provides definitions and examples of common units used to measure length, mass, temperature, time, area, volume, density, and weight. Key points covered include: 1) Early measurement standards were based on body parts but were inconsistent; the meter and kilogram were established as consistent base SI units. 2) All measurements require both a number and a defined unit, such as "5 meters". 3) Common prefixes are used to modify base units to measure very large or small quantities. 4) Different instruments are used to measure different physical properties, such as thermometers for temperature and balances for mass.

1. Unit 1Using SI Units

2. Measurement StandardAn exact quantity that people agree to use for comparison.* helps you get the same answer as other people

3. What was used as the earliest measurement standards?Body Parts * The question then, is WHO’S body parts?The KING’S or QUEEN’S

4. Is your hand or a body part a good standard of measurement?* no* people’s hands are not the same size * get different answers

5. In order for any measurement to MAKE SENSE; two things must be included.1.) a number2.) a unit

6. Every type of measurement has a base or central unit.* meter (distance or length)* liter (volume)* gram (mass)* second (time)

7. Adding a prefix to a base (central) unit, you can create a whole new unit to measure any object.

8. Prefixes Used When Measuring:Large Objectskilo = 103hecto = 102deka = 101Small Objectsdeci = 10-1centi = 10-2milli = 10-3

9. Measurements that can be madeLengthMassTemperatureTimeAreaVolumeDensityWeight

10. LengthThe distance between two points.Base (central) units of length* (US) FOOT [ft]* (SI) METER [m]

11. LengthLength of an object or the distance between two points is measured using a METERSTICK.

12. Mass“A body of coherent matter.” * a collection of stuff joined to form an objectBase (central) units of mass* (US) SLUG [slug]* (SI) KILOGRAM [kg] sometimes gram [g]

13. MassMass is measured using a BALANCE.

14. TemperatureMeasurement of how hot or cold something is.

15. TemperatureBase (central) units of temperature* (US) FAHRENHEIT [oF]* (SI) CELCIUS [oC] > (SI) KELVIN [K] * this is an absolute scale

16. TemperatureTemperature is measured using a THERMOMETER.

17. Absolute ZeroThe coldest possible temperature.* temperature where ALL motion stops* 0 Kelvin* found by the formula: K = oC + 273.16

18. TimeInterval between two events.Base (central) units of time* (US) SECOND [s]* (SI) SECOND [s]

19. TimeTime can be measured using a CLOCK or a CALENDAR.

20. Derived UnitsObtained by combining multiple units of measurement.

21. AreaThe amount of surface included in a set of boundaries.Found by the formula:* Area = lengthx width

22. AreaWhat is the difference between length and width?DIRECTION

23. AreaBase units of area* (US) FEET SQUARED [ft2]* (SI) METERS SQUARED[m2]

24. VolumeThe amount of space an object occupies.Easy with liquids & gases, harder with solids* for a solid you may need the formula:volume = l x w x h

25. VolumeFor a liquid or a gas all you need is a devise that is designed to measure volume.* a beaker, a flask or a graduated cylinder

26. VolumeBase (central) units of volume* (US) GALLON [gal]* (SI) LITER [L] sometimes centimeters cubed [cm3]

27. Volume1 milliliter equals 1 centimeter cubed.* 1 mL = 1 cm3

28. DensityThe measurement of how thick, compact and solid an object is.Relationship between the mass & volume of an object

29. DensityFound by the formula:* Density = mass ÷ volumeExpressed in g/Lorg/cm3* a mass unit / a volume unit

30. WeightMeasurement of the force of gravity pulling on the mass of an object.Changes as gravity changes.Base units of weight* (US) POUND [lb]* (SI) NEWTON [N]

31. WeightWeight is measured using a SPRING SCALE.

32. MASS and WEIGHT are NOT the same thing!

33. Physical PropertiesCharacteristics of a substance that can be used to identify it.ColorShapeTextureState of matterSizeAll measurements(changing a physical property does NOT change the substance)

34. The End