Annihilation:
A process in which a particle and antiparticle combine and release their rest energies in other particles.
 
Antineutrino:
"The antiparticle of neutrino
 
Archimedes principle:
A body immersed in a fluid experiences an apparent loss in weight which is equal to the weight of the fluid displaced by the body.
 
Atomic mass unit:
"It is equal to one-twelfth the mass of C -12 isotope of carbon
 
Atomic number:
The number of protons in an atomic nucleus.
 
Avogadro number:
"The number of molecules in a gram molecular weight of a substance
 
Avogadro's law:
"Under the same conditions of temperature and pressure
 
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