Capitalizing words only applies in a handful of circumstances:
1) The first word of a sentence.
2) The first word of a sentence in quotes, as with "This example is appropriate."
3) A proper noun (Jody, Empire State Building, Germany).
4) A person's title (Dr. Thugnor, Mr. Frotnip, Sir Henry Aith, or simply Doctor).
5) Compass points when they refer to regions ("I'm coming down from the North").
There are more rules that can be found at the related link below. However, to answer this question, "atmosphere" is not capitalized if it refers to air, but if you were referring to the name of a band, then you would capitalize it:
"The atmosphere was thick with dust."
"I bought the latest album from Atmosphere."
"I read Atmospheres Of Planets the other day."
No, "atmosphere" should not be capitalized in a sentence unless it is the first word or part of a proper noun like "Earth's Atmosphere."
no because the atmosphere is big and has lots of parts you can capitalize the parts of the atmosphere
No, "transition process" should not be capitalized in a sentence unless it is the first word in the sentence or part of a title.
Yes, "PC" should be capitalized in a sentence.
No, "secondary students" should not be capitalized in the middle of a sentence unless it is a proper noun or at the beginning of a sentence.
No, the word "fifteen" should not be capitalized in a date within a sentence unless it is the first word of the sentence.
No, the word "mammogram" should not be capitalized within a sentence unless it is at the beginning of a sentence or part of a title.
No. The separate levels of the atmosphere are not capitalized.
No, except at the beginning of a sentence because it is n ot a proper n ou n.
Should breakfast be capitalized in a sentence
No, "transition process" should not be capitalized in a sentence unless it is the first word in the sentence or part of a title.
No, the word forecast should not be capitalized in a sentence.
Yes it should be capitalized.
Yes it should be capitalized.
Have should be capitalized if it is the beginning of a sentence. Summer should not be capitalized.
No it shouldn't be capitalized.
No it shouldn't be capitalized.
No, "methadone" should not be capitalized unless it is at the beginning of a sentence or part of a proper noun (such as a specific brand name).
" When a car is driven the gasoline it burns as fuel release carbon dioxide into atmosphere" as stated in your question is properly capitalized. If the same sentence were properly punctuated, and used all the correct wording, it would read like this: "When a car is driven, the gasoline it burns as fuel releases carbon dioxide into the atmosphere."