hr

Everyday

1. "hr" is a short written form of "hour", and "hrs" of "hours". tree →
2. HR (capital letters) stands for "human resources", the part of a company that looks after hiring and workers. tree →

In the lessons

In maths, timetables and science tables: "2 hrs 30 min", speed in "km/hr" (better "km/h"). On signs: "24 hr shop". HR appears in grown-up work talk. It is read aloud as "hour(s)".

Examples

• The film is 2 hrs long. tree →
• The shop is open 24 hrs a day. tree →
• The car went at 60 km per hr. tree →
• Cook for 1 hr at 180 degrees. tree →
• 3 hrs = 180 minutes. tree →
• The table showed hrs worked each day. tree →
• Mum had a meeting with HR at work. tree →
• The walk took 1 hr 15 min. tree →

Note

Abbreviation, not a word; in full writing say "hour". 1 hr = 60 min; 1 hr = 3600 seconds; 24 hrs = 1 day. Scientists usually write "h" not "hr". Trap: "hr" is not a whole number of minutes in decimals: 1.5 hrs = 90 min, not 150.