# Measurement

OP1 measure length, mass, time and temperature, understand that units of measurement follow the SI system

measure length, mass, time and temperature

Measurement is the process of assigning a number to an attribute (or phenomenon) according to a rule or set of rules.

The term can also be used to refer to the result obtained after performing the process.

So what do we measure?

What could we measure about you or your class?

What do we need to Measure ?

measuring and recording

perform simple calculations based on these to find the derived quantities:

area, volume, density, speed, velocity, and acceleration

Irregular area Area

Find the area of the palm of your hand ...

volume

density

speed velocity

acceleration

understand that units of measurement that we use in Ireland follow the SI system

Take out a pencil each, measure the length of your desk in pencil units!

That is how many pencil lengths wide is your desk ?

Now compare your results to your neighbours

Did you all get the same answer?

Why? Are the desks not the same size ?

What is wrong with the following sum

£3 + \$4 = €7 ??

How could we compare your measurement to your friend, a person in China?

presenting and communicating data

How can we communicate these measurements?

Try this

So it is important if we want to compare measurement we must have a set of Standard Units !!

How to convert from one set of units to another

go here next, why we use units, what are these unit, why we use metric now and not imperial,

if students would prefer to use the old units ... I think they should be let .... see how that works our

http://library.thinkquest.org/16600/beginner/units.shtml

Most of the measurement stuff you will need to know is here

http://www.mathsisfun.com/measure/metric-system-introduction.html

how many ml in a drop ??

how many ml in a teaspoon ??

orders of scale ...... the prefixes

Scale of stuff explained! from the VERY BIG to the very small

http://www.cefic.org/metricscale/scale.htm

Some non-standard units of measurement can be found here

http://en.wikipedia.org/wiki/List_of_humorous_units_of_measurement

1mole is = 6.022 × 1023 particles/mol = formula weight expressed in grams

OP2 measure mass and volume of a variety of solids and liquids

Measure the Mass and Volume of a Variety of Solids

The mass of solids is easily measured by using a top pan balance.

Zero the balance first then place the solid on the pan and record the digital reading of its mass.

Make a table of the objects that you measured,

A two step process is needed to find the mass of a liquid.

First measure and record the mass of a clean dry beaker using a top pan balance e.g. 30 g.

Pour the liquid into the beaker and measure the mass of the beaker plus the liquid e.g. 70 g.

By subtraction the mass of the liquid is calculated: 70 g – 30 g = 40 g.

Now find the volume ...

how do we find the volume of

• A cube?
• A sphere?
• A cylinder ?

How could you find the volume of a liquid?

How could you find the volume of a small stone ?

How could you find the volume of a large stone ?

To compare the size of things in space to how they compare to the places you know ...

http://www.howbigreally.com/dimension/space