Observations and inferences are important in science. How would you explain the differences between the two words?

Explanation:

when you Observe, you describe what you are seeing at the moment. so observation means seeing.

inference is the result you receive by observation.

for example, "I threw a stick and the dog ran after it and brought it back to me" this is an observation. you don't mention the reason why the dog brought you the stick. you just describe what happened!

but if you say, "the dog was trained to bring back the stick." you are mentioning the reason of the dog's behavior and that's inference.

heat a spark and oxygen

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.