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你們知道狠多種單位....例如長度或體積等........
但是印度的單位知道的人大概不多.......而且都是專業方面的人士才知...
像是HRC........(我看到這個常常會和本田機車隊聯想...嘿嘿..)..
HRC是工業硬度的單位....叫做洛克威爾硬度(Rockwell Scale).....
測試是使用一個一百二十度的鑽石圓錐加壓....或十六分之一的鋼球(1.5875mm).......
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Scale Abbreviation Load Indenter Use
| A | HRA | 60 kgf | 120° diamond cone† | Tungsten carbide |
| B | HRB | 100 kgf | 1/16 in diameter steel sphere | Aluminium, brass, and soft steels |
| C | HRC | 150 kgf | 120° diamond cone | Harder steels |
| D | HRD | 100 kgf | 120° diamond cone | |
| E | HRE | 100 kgf | 1/8 in diameter steel sphere | |
| F | HRF | 60 kgf | 1/16 in diameter steel sphere | |
| G | HRG | 150 kgf | 1/16 in diameter steel sphere | |
| †Also called a brale indenter | ||||
http://en.wikipedia.org/wiki/Rockwell_scale
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