H0

H0 (read: "H-zero") is:

• the most common size for model railways: nominal size H0
• the abbreviation for the standard load profile of a household in energy technology

H ₀ is:

• Magnitude of the acid strength in Hammett's acidity function
• in statistics the null hypothesis
• in astrophysics the Hubble constant

See also:

• HO

This is a disambiguation page for differentiating between several terms identified with the same word.