Measurement Notes

Measurement Notes

Measurement- the size or amount of something

 

Unit- an amount that is used by everyone when measuring a particular thing (grams, liters, meters=metric)

 

Standard- a unit that serves as a basis for certain measurements

 

Metric unit-a unit of measurement that is based on the number ten and multiples of 10 (grams, meters, liters)

 

SI- International System of Units

 

The SI units are also known as the metric system and are used by the scientific community as a standard

 

Customary is not the same as metric

 

Mass

Basic unit is gram (g)

Tools: triple beam balance, balance scale

 

Mass is the measure of the amount of matter in an object

 

Mass does not mean weight

 

Mass is constant and weight is determined by the pull of gravity on the object

 

Temperature

Basic Unit degrees Celsius (oC)

Tool is the thermometer

 

Water freezes at 0 oC,

Water boils at 100oC

Average/normal body temperature is 37oC

 

Time

Basic unit is seconds

Tools-clock, watch, stop watch, timer

 

 

 

Length/Distance

Basic unit is meter (m)

Tools: meter stick, metric ruler, trundle wheel and tape measure

 

Area-the number of square units (units 2) that is needed to cover a space

 

Volume of a liquid or gas

Basic unit is liter (l) (mL)

Tools: beaker, graduated cylinder

 

Volume is the number of cubic units (units3) that is needed to fill a space

mL=cm3

When using a graduated cylinder or a beaker, you use the bottom of the meniscus to take a reading

 

Solid volume is measured in two ways

  1. If a solid has a regular shape you use the formula l x w x h(cm3)
  2. If an object has an irregular shape you place the object in water in a graduated cylinder or beaker and you measure the water displacement