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| an exact quantity against in which comparisons can be made |
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| (K) x 1000 ; one thousand meters in one kilometer |
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| (d) 1/10 ; ten decimeters in one meter |
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| (c) 1/100; one hundred centimeters in one meter |
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(m) 1/1000
one thousand millimeters in one meter |
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| Measurement from end to end |
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(m) SI unit used to measure length
o Kilometer (km) 1000m
o Centimeter (cm) 1/100m |
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Amount of space on a surface of an object
o Length x Width (lw)
o Square meter (m2) – SI unit for area |
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Amount of space occupied by an object;
o To calculate volume:
Length x Width x Height ( lwh)
o Cubic meter (m3) – SI unit for volume
o Volume is measuring water displacement in a graduated cylinder |
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Measurement from end to end.
Meter (m) – SI unit used to measure length
• Kilometer (km) 1000m
• Centimeter (cm) 1/100m |
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Area – Amount of space on a surface of an object.
• Length x Width
• Square meter (m2) – SI unit for area |
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Volume – Amount of space occupied by an object.
• Length x Width x Height
• Cubic meter (m3) – SI unit for volume
• Measure water displacement in a graduated cylinder |
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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 |
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Density – Amount of mass an object has for its volume.
• Density =That’s mass divided by volume
• Grams per Cubic Centimeter (g/cm3) – SI unit for density
• Water is often used as a standard for density |
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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. |
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Temperature – average energy of the particles in a substance.
Celsius (oC) – Most commonly used unit for temperature
Water freezes 0 oC
Water boils 100 oC
Body Temp. 37 oC
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 Freezes 273 K
Water boils 373 K |
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Time – the period between two events
Seconds (s) – SI unit for time |
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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 |
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. Estimation is a close guess.
• Use when a measuring device is not available or precision is not necessary
• Saves time |
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| Precision – Degree of exactness with which an object is measured. |
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