Nowadays antimatter is defined as a material with weight made of the anti-version of the corresponding particle. That means that dor a proton is an anti-proton for example. Although it is made each day, it is made in minuscule amounts. If you would add up all the antimatter produced and somehow weighed it, it would only be a few nanograms. Each day it is made at the Large Hadron Collider (LHC) for example. It is very expensive; scientists claim that antimatter is the costliest material to make. In 2006, Gerald Smith estimated $250 million could produce 10 milligrams of positrons (equivalent to $25 billion per gram); in 1999, Nasa gave a figure of $62.5 trillion per gram of antihydrogen. Of course these figures are theoretical because if there was a way to create so much the price would drop probably. It is so costly because making it is slow and it takes a lot of energy. In addition storing antimatter is extremely difficult because when it comes in contact with matter both disappear leaving only leaving lots and lots of energy. All the energy is released. One gram of antimatter with 1 gram of matter produces almost the same amount of energy as 43,000 kilograms of TNT exploding. Right now antimatter is far too expensive and inefficient to produce, but in the future it may be a widely used energy source because it is so high in energy/mass. I think that at the end of the 21st century we will at least be using antimatter as some kind of space travel fuel because especially in space it has many advantages.
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