It does not need to be unless at the start of a sentence. In American English however, there is a bad tendency to capitalize.
No. Names of unique places should be capitalized. For example, the Amazon is a unique place and therefore should use an upper case "A". The rain forest there is one of many rain forests and so does not represent a unique place.
Yes, "Fahrenheit" should be capitalized as it is derived from a proper noun, German physicist Daniel Gabriel Fahrenheit, who developed the temperature scale.
Not unless it's the first word of a sentence. It is a common noun.
According to the CRC Handbook, 70th edition, the density of 94% ethanol is 0.8070 g/ml and the density of 96% ethanol is 0.8013 g/ml. We can interpolate to find that the 95% ethanol should be 0.8042 g/ml.
The full name of the element does not need to be capitalized, unless there is some independent grammatical reason for capitalization such as being in a title or the first word of a sentence. Thee chemical symbol for phosphorus, however, should be the single capital letter P.
It depends on the context. If you are using "alcohol" as a general term for the substance, it is not capitalized. However, if you are referring to a specific type of alcohol (e.g., Ethanol), then it should be capitalized.
Have should be capitalized if it is the beginning of a sentence. Summer should not be capitalized.
It should only be capitalized if it forms part of a title.
Yes it should be capitalized.
The first 'c' should be capitalized.
Yes, it should be capitalized.
Yes it should always be capitalized.
As an abbreviation it should be capitalized.
Yes it should be capitalized.
No it should not be capitalized.
No. It should not be capitalized.
"Western" should be capitalized and "world" should not.