Originally Posted by sidewinder22
Altitude/elevation and latitude will also affect weight. A disc may be legal in the north pole or the rocky mountains, but not at the equator or sea level.
Altitude affects "weight" only. The measurement that is used on golf discs is grams which is a unit of "mass". Mass doesn't change just because of elevation. A 175g object at sea level is still 175g on top of Mt. Everest and on the moon even as long as the properties of that object didn't change.
The properties of golf discs can change as the plastics absorb water from the air and become more "dense" and gain mass. So a disc that is 175g at 80% humidity at a high elevation could be much lower in the dry air of Death Valley, even though it is much lower in elevation. The weight may do something totally different because of the elevation change.