If an aeroplane flew from Langley airport with an altimeter setting of 29.82 in Hg to Victoria Harbour, with the altimeter indicating 100 feet, what is the correct altimeter setting for Victoria Harbour?

To determine the correct altimeter setting for Victoria Harbour, let's analyze the situation. The aeroplane departed from Langley airport with an altimeter setting of 29.82 in Hg. Upon arrival at Victoria Harbour, the altimeter reads 100 feet. This height shows the current elevation based on the altimeter setting at that point.

Altimeters work by measuring atmospheric pressure and converting it into altitude. A standard reference pressure setting at sea level is 29.92 in Hg. If the altimeter reading of 100 feet is based on the local atmospheric pressure at Victoria Harbour, the local pressure must be lower than the standard setting because the indicated altitude is above sea level.

To update the altimeter setting from 29.82 in Hg to reflect the local pressure, we consider that as the altimeter setting increases, the indicated altitude decreases, and vice versa. A reading of 100 feet indicates that the actual atmospheric pressure at Victoria Harbour is lower than the current altimeter setting of 29.82 in Hg. Therefore, to find the correct setting that would allow the altimeter to read 100 feet correctly at Victoria Harbour, the setting must decrease.

The correct altimeter setting that aligns with this reasoning is 29.72 in Hg