Which gas was commonly used in airships? A) Nitrogen B) Helium C) Hydrogen D) Hydrogen sulphide Related MCQs: The gas, commonly known as “laughing gas” is: The gas commonly known as “Laughing gas” is: Commonly known as ‘Laughing gas’ is: The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the ——–temperature