Summarize Why conduction occurs in all materials but convection only occurs in liquid and gases.

Conduction in Gases and Liquids

Because the molecules of fluids have a greater freedom of motion than in solids, there is less of a chance that vibrating molecules will collide with another and transfer energy throughout the fluid.

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.