Why does water boil at 100 degrees in Melbourne, but not in other places?

Water boils at 100°C (212°F) at sea level under standard atmospheric pressure (1 atmosphere or 101.3 kPa). In Melbourne, which is near sea level, water generally boils at this temperature. However, at higher altitudes, atmospheric pressure decreases, which lowers the boiling point of water. For example, in mountainous regions, water may boil at temperatures lower than 100°C due to reduced air pressure. This is why the boiling point of water can vary depending on elevation, and places at higher altitudes will see water boiling at temperatures below 100°C.