1. During indicates within a period of time.
We slept during the day.
They practiced basketball during the summer.

2. During means at the same time as another event.
I slept during the football game.
They lived in the north during the war.

Unit
Unit : british thermal unit (btu) (59 f)
Formula :
in si : 1054.8
si unit : m2*kg/sec2(joule)
in cgs : 1.05E+10
cgs unit : cm2*g/sec2(erg)
Category : energy.      .. More >>