Does gravity or altitude effect weighing?
Yes, but unless you are making weighings at the very highest level of accuracy, the consequences are probably too small to worry about. Whilst the variation in gravitational attraction with altitude and latitude is otherwise significant (see below) its effect on most weighing procedures largely cancels out provided that your balance (particularly the single-pan variety when used to make direct measurements) is set up properly and calibrated. Before reading the rest of this section, though, it is worth being sure of the differences between comparators, balances, comparative weighing and direct weighing.
