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/standard are not the same as metric



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



Degrees Celsius (oC)

Kelvin (K)- an absolute temperature scale, "absolute" as the temperature at which molecules would stop moving


Tool is the thermometer




Water freezes at 0oC, 273.16 K

Water boils at 100oC, 373.16 K


Average/normal body temperature is 37oC, 310.15K



Basic unit is seconds

Tools-clock, watch, stop watch, timer



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




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