Hamburgers were invented in what country?

?• 1 horsepower is 745.7 watts
?• 1 horsepower = work equal to lifting 550 lbs of weight to one foot for one second
?• 1 calorie is equal to 4.2 Joules
?• 1 barrel is equal to 159 liters
?• 6 feet = 1 fathom
?• 1 kwh = 3.6 x 10 power 6 joules
?• A 100 watt bulb lights for 1 hour uses 100 watt hour of electricity
?• -273 degree centigrade is called absolute zero temperature.
?• Standard pressure is 760 mm or 14.7 lb/in2
?• Gross is equal to 12 dozens
?• Mach 2 = 500 miles per hour
?• 1 nautical mile = 1825 meters
?• Unit of pressure is Pascal
?• Force is measured in Newton (SI), Dyne (CGS)
?• At -40 deg F Fahrenheit scale is equal to centigrade scale
?• Hertz and Angstrom are units of frequency
?• Units of work and energy are Joule and Erg (CGS)
?• Diopter is unit of power of lens
?• Unit is density is kg/m3
?• Unit of power is watt, BTU (Board of Trade Unit)
?• Unit of electric charge is Coulomb
?• Unit of voltage is volt
?• Unit of electric resistance is ohm
?• Unit of capacitance is Farad
?• Unit of magnetic flux is Weber, Tesla
?• Unit of radioactivity is Becquerel
?• Unit of luminous intensity is candle, lux
?• Unit of crude oil is Barrel
?• Unit of volume of water is cusec, cubic/sec