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This is a much more complicated question than it appears. In everyday use, and indeed for most science upto A-level, the intuitive notion of 'amount of stuff' works pretty well - things with more mass have got more 'stuff' in them.
At a higher level there are several different but equivalent definitions. In mechanics you define mass as a measure of the resistance of an object to acceleration; when dealing with high speeds or high precisions you can use E=mc^2 to describe mass in terms of the energy of an object; you can describe mass as 'gravitational charge', measuring how strongly an object is influenced by gravity. There are also several quantum definitions.
Note: mass should not be confused with weight! Mass measures the amount of material present but weight measures how strongly an object is affected by gravity: your weight pulls you down to the surface of the planet when you jump and would be less on the moon (which has a weaker gravity field) whereas your mass would be the same. Mass is measured in kg and weight (as a force) in Newtons. On earth the gravitational field strength, g, is about 10 so 1kg=10N on earth. On the moon 1kg would have a weight closer to 2N.
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What is the related formula to define density?
Density is mass divided by volume (usual units are grams per millilitres)
How do you define a variable?
I define an variable by saying x- an value
Define measurement and characteristics of measurement?
Define these Levels of Measurement.NominalOrdinalInterval/Ratio
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4 points define a plane.
Why mole fraction is independent of temperature?
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What is define mass?
mass is the amount of space
What define mass?
mass is the amount of space
Which term is used to define define the way the mass of subatomic particles is described?
Atomic Mass units =]
How does the US define genocide?
mass-murder
Does density define an objects mass?
weight
What term is used to define the way mass of subatomic particles is described?
Atomic Mass units
Which term is used to define the way the mass of subatomic is described?
Atomic Mass units =]
One-twelfth the mass of a carbon-12 atom is used to define?
Atomic mass.
What is the property of an objects mass and velocity?
An object's mass and its velocity define the object's MOMENTUM.
Define mass transfer?
Mass- a measure of how much space an object takes up
Which term is used to define the way the mass is subatomic particles is described?
Atomic Mass units =]
Which term is used to define the way the mass of subatomical particles is described?
Atomic Mass units =]
