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HOW TO REMEMBER FORMULA AND CALCULATOR?
Try INVBAT.COM
INVenting Brain Assistant Tools
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Demonstration on how to use your smartphone as your formula and calculator tool
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VOICE DATA ENTRY
valid only for smartphone with microphone icon.
Touch clear button. Next touch any white button. Next touch microphone icon 
. Next speak numbers only.
For decimal use the word "point" example say, "thirteen point seventy five" . Then touch the Solve button.
Energy Conversion
btu
= ft-lbf
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Beta testing for limited time
btu
= kWh
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btu
= quad
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btu
= calorie
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btu
= J or N*m
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kWh
= J or N*m
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Beta testing for limited time
calorie
= hp-hr
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calorie
= J, N*m
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Beta testing for limited time
GJ
= MWh
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Beta testing for limited time
MMBtu
= MWh
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Beta testing for limited time