 # Unit 2 Measurement. QuestionAnswer 1.What is a standard? 1.A standard is an exact quantity against which comparisons can be made. The “foot” was based.

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Unit 2 Measurement

QuestionAnswer 1.What is a standard? 1.A standard is an exact quantity against which comparisons can be made. The “foot” was based on the king’s foot changed with each new king Most standards were based on common objects

QuestionAnswer 2. The development of the metric system. 2. Le Systeme International d’Unit Scientists in France developed a new system in 1791. SI units were adopted for science in 1960. Uses the metric system Based on the number ten (fingers and toes).

QuestionAnswer 3. Common metric prefixes 3. Kilo k x 1000 a) one thousand meters in one kilometer Deci d 1/10 a) ten decimeters in one meter Centi c 1/100 a) one hundred centimeters in one meter Milli m 1/1000 a) one thousand millimeters in one meter

QuestionAnswer 4. What is length? 4. Measurement from end to end. Meter (m) – SI unit used to measure length Kilometer (km) 1000m Centimeter (cm) 1/100m

QuestionAnswer 5. Common metric prefixes. 5. Kilo k x 1000- one thousand meters in one kilometer Deci d 1/10- ten decimeters in one meter Centi c 1/100-one hundred centimeters in one meter Milli m 1/1000- one thousand millimeters in one meter

QuestionAnswer 6. What is length? 6. Length – Measurement from end to end. Meter (m) – SI unit used to measure length Kilometer (km) 1000m Centimeter (cm) 1/100m

QuestionAnswer 7. What is area? 7. Area – Amount of space on a surface of an object. Length x Width Square meter (m 2 ) – SI unit for area

QuestionAnswer 8. What is volume? 8. Volume – Amount of space occupied by an object. Length x Width x Height Cubic meter (m 3 ) – SI unit for volume Measure water displacement in a graduated cylinder

How much liquid is there?

QuestionAnswer 9. What is mass? 9. Mass – Amount of matter in an object. Kilogram – SI unit for mass Gram, milligram One liter (L) of pure water has mass of 1 kg

What is the mass?

QuestionAnswer 10. What is density? 10. Density – Amount of mass an object has for its volume. Density =That’s mass divided by volume Grams per Cubic Centimeter (g/cm 3 ) – SI unit for density 3) Water is often used as a standard for density

QuestionAnswer 11. What is weight? 11. Weight – The measure of the force of gravity acting on an object. Newton (N) – SI unit for force and weight Weight changes as gravity changes.

QuestionAnswer 11. What is weight? 11. Weight – The measure of the force of gravity acting on an object. Newton (N) – SI unit for force and weight Weight changes as gravity changes.

QuestionAnswer 12. What is temperature? 12. Temperature – average energy of the particles in a substance. Celsius ( o C) – Most commonly used unit for temperature Water freezes0 o C Water boils100 o C Body Temp.37 o C Kelvin (K) – Official SI unit for temperature Absolute Zero – temperature at which almost all movement of the atoms in a material stops – 0 K Water Freezes273 K cWater boils373 K

QuestionAnswer 13. What is time? 13. Time – the period between two events Seconds (s) – SI unit for time

QuestionAnswer 14.What is accuracy? 14. Accuracy- is the degree of closeness of a measured or calculated quantity to its actual (true) value. In other words: How close you come to standard Depends on the person doing the measuring

QuestionAnswer 14.What is accuracy? 14. Accuracy- is the degree of closeness of a measured or calculated quantity to its actual (true) value. In other words: How close you come to standard Depends on the person doing the measuring

QuestionAnswer 15. What is estimation? 15. Estimation is a close guess. Use when a measuring device is not available or precision is not necessary Saves time

QuestionAnswer 15. What is estimation? 15. Estimation is a close guess. Use when a measuring device is not available or precision is not necessary Saves time

QuestionAnswer 16. What is precision? 16. Precision – Degree of exactness with which an object is measured. Depends on measuring instrument

Main IdeasDetails Mass, Weight, and Density  Density – Amount of mass an object has for its volume o Density =mass volume That’s mass divided by volume o Grams per Cubic Centimeter (g/cm 3 ) – SI unit for density o Water is often used as a standard for density

Main IdeasDetails Mass, Weight, and Density  Weight – The measure of the force of gravity acting on an object o Newton (N) – SI unit for force and weight o Weight changes as gravity changes Summary:

Main IdeasDetails Temperature and Time  Temperature – average energy of the particles in a substance o Celsius ( o C) – Most commonly used unit for temperature  Water freezes: 0 o C  Water boils : 100 o C  Body Temp. : 37 o C o Kelvin (K) – Official SI unit for temperature o Absolute Zero – temperature at which almost all movement of the atoms in a material stops : 0 K  Water Freezes: 273 K  Water boils: 373 K Summary:

Main IdeasDetails Temperature and Time  Time – the period between two events o Seconds (s) – SI unit for time Summary:

Unit II- Measurement Part IV Accuracy, Estimation and Precision

Main IdeasDetails Accuracy, Estimation and Precision  Accuracy o How close you come to standard o Depends on the person doing the measuring Summary:

Main IdeasDetails Accuracy, Estimation and Precision  Estimation: o Close guess o Use when a measuring device is not available or precision is not necessary o Saves time  Precision – Degree of exactness with which an object is measured o Depends on measuring instrument Summary:

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