An interesting websearch engine:
http://www.wolframalpha.com/
Type for example: "180 liters" or "45 UK gallons"
Watch this video: http://www48.wolframalpha.com/screencas ... alpha.html
Have fun
http://www.wolframalpha.com/
Type for example: "180 liters" or "45 UK gallons"
Watch this video: http://www48.wolframalpha.com/screencas ... alpha.html
Have fun