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Power (Heat flow)
Unit Name Symbol SI Equivalent 
· ton (refrigeration, UK) 
CTR (UK)  3922.7 W 
· ton (refrigeration, US) 
CTR (US)  3516.8 W 
· volt-ampere 
VA  1 W 
· watt 
W  1 W 
· watt (int. mean) 
W  1.00019 W 
· watt (int. US) 
W  1.00016 W 
Refractive power
Unit Name Symbol SI Equivalent 
· dioptre 
  1 /m 
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