MASS is a measure of the amount of matter in a body!

Mass is the quantity of matter in an object.

Mass is a scalar quanitity, that is it has no direction with it.

Mass is measured in grams or kilograms, (or in imperial units ounces, pounds, etc.) The amount of matter in a body does not change (unless some part of the body is removed).

How can we measure the mass of an object ?

A mass balance or often known as a weighing scales

Mass Balances are delicate pieces of equipment,

never push down on the pan.

The 1st thing to check is that the reading says zero at the beginning of taking any measurement.

There is usually a way to re-zero the balance. Some people call this calibration.

If the balance does not read zero before hand then

Find the mass of some objects

The Mass of _____ is _______

The Mass of _____ is _______

The Mass of _____ is _______

The Mass of _____ is _______

The Mass of _____ is _______

In the formula for force you see m for mass.

Weight is often confused with mass,

we get the butcher to weigh out our meat, he gives us an answer in kilograms (or pounds).

This is what causes the usual confusion between mass and weight.

1000 g = 1 kilogram

1000 kg = 1 tonne ....

16 oz = 1 lb

14 lb = 1 stone

the Weight of an object can be considered to be 10 times the mass of the object, with the units of the answer in Newtons

how much is 1 kilogram .......

How could we measure the mass of some water ?

Measure the mass of a vessel _____g

Measure the mass of the vessel & water ____g

Find out the mass of the water _____g

Air has mass Weighing air

On a simple scale a 3 L bottle, with a valve in the lid

is balanced by a counter weight.

Air is pumped into the bottle until the pressure is doubled.

The bottle is then heavier.

A small extra weight (3.6 g) is used to restore equilibrium.

Rory Geoghegan UCD: for IOP Frontiers in Physics, 27/09/2008,

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