Even a new, minimum efficiency air conditioner or furnace can be a significant jump in efficiency. The old furnace in your basement may only be originally rated at 60% to 70% AFUE. In order to comply with national regulations, furnaces manufactured today have to be rated at a minimum of 80% AFUE.
dipole - a pair of equal and opposite electric charges or magnetic poles separated by a small distance. couple - (physics) something joined by two equal and opposite forces that act along parallel lines. electric dipole, electric doublet - a dipole with equal and opposite electric charges.
[Bond dipole moment] is a vector, parallel to the bond axis, pointing from minus to plus, as is conventional[1] for electric dipole moment vectors. (Some chemists draw the vector the other way around, pointing from plus to minus, but only in situations where the direction doesn't matter.)[1].f you are reading a chemistry book and you are not sure how they havedefined the dipole moment, the easiest way to figure it out is to finda molecule in the book that has a highly electronegative atom in it(O, F, Cl) and assume that that atom is the partial negative end ofthe dipole.