**Measurement Notes**

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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

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

Degrees Celsius (^{o}C)

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

Tool is the thermometer

Water freezes at 0^{o}C, 273.16 K

Water boils at 100^{o}C, 373.16 K

Average/normal body temperature is 37^{o}C, 310.15K

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 (units^{3}) that is needed to fill a space

mL=cm^{3}

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

- If a solid has a regular shape you use the formula l x w x h(cm
^{3}) - 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