The boiling point of water decreases with the reduction of atmospheric pressure. Since the pressure at an altitude of 8,848 m gets highly reduced, the boiling point of water also gets drastically reduced. With every 285 m of elevation, the boiling point decreases by 1°C. The boiling point of water on Mount Everest (8,848 m) …
Invention of the thermometer
In about 1607, Galileo invented an instrument that could measure the rise of water in a glass tube with the rise in temperature. This instrument is called a thermoscope. Later, scientists modified it to add a scale to mark the rise of water. Subsequently, water was replaced with alcohol and mercury.