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Hello everybody. I'm thinking about to make the Lava Rock acquarium bakground at https://www.instructables.com/id/Lava-Rock-Aquarium-Background/ . But when I want calculate the volume I have a problem with converting gallones into litres. Does somebody know If there are used the usual gallones (=4,55 litres) or american ones (=3,79 litres)?

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Putting on my deerstalker and lighting my pipe . . .

The Instructabler hasn't posted for a couple of years so there's no point in asking the question in the 'comments' section.

However, there are a couple of clues in the text of his Instructables :-
1) He uses the term "dime - nickel sized dab" - American.
2) He uses the work "neutralize" - Not definitive, but  used in USA more than "neutralise" used elsewhere.
3) He mentions "96 cents and \$15 in one Instructable - Definitely American.
4) His profile says he is from Wichita, Kansas #;¬)

So I would say he is definitely residing in the United States of America.
The American gallon is the old "Queen Anne" gallon, defined as 231 cubic inches in 1707, but the NEW question is, DO AMERICANS USE AMERICAN GALLONS WHEN MEASURING AQUARIUM CAPACITY?

Looking HERE It lists a 300 gallon aquarium as having dimensions of 96 x 30 x 24 inches.  This gives a volume of 69120 cubic inches.  Divide this by 231 (cubic inches in an American gallon) and you get 299.22 gallons - Near as dammit to the 300 gallons listed.

So . . . I think we're pretty safe in assuming that Americans measure aquarium capacity in American gallons, which is, as you say, 3.79 litres.

Hmmm . . . What was in that pipe?

(That MUST be worth a 'Best Answer' #;¬)

Use what you want for what you need - ask your fish-monger if you're unsure.

L

if you are using windows 7 on calculator click view and select unit conversion it will help you or google is your friend