Definition:Time/Unit/Hour
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Definition
The hour is a derived unit of time.
Conversion Factors
\(\ds \) | \(\) | \(\ds 1\) | hour | |||||||||||
\(\ds \) | \(=\) | \(\ds 60\) | minutes | |||||||||||
\(\ds \) | \(=\) | \(\ds 60 \times 60\) | \(\ds = 3600\) | seconds |
Symbol
- $\mathrm {hr}$
The symbol for the hour is $\mathrm {hr}$.
The $\LaTeX$ code for \(\mathrm {hr}\) is \mathrm {hr}
.
Historical Note
The hour was formerly defined as being $\dfrac 1 {24}$ of a mean solar day.
Sources
- 1969: J.C. Anderson, D.M. Hum, B.G. Neal and J.H. Whitelaw: Data and Formulae for Engineering Students (2nd ed.) ... (previous) ... (next): $1.$ Units and Abbreviations: $1.3$ British and other units
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $60$
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $3600$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $60$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $3600$
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): hour
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): hour