Answer:
Relative atomic mass or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant. The atomic mass constant is defined as being 1/12 of the mass of a carbon-12 atom.
Characteristic properties are used because the sample size and the shape of the substance does not matter.
Answer:
its caused by the convection of air masses with differences in densities mainly due to their differences in temperatures.
-Hops
