Concept:A hypsometer is an instrument used to determine the boiling point of water, also known as the steam point.
Explanation:The steam point is the temperature at which water boils under normal atmospheric pressure, which is
100∘C.
In a hypsometer, water is boiled and the temperature of the steam is measured accurately.
This measured temperature directly gives the steam point at the prevailing pressure.
Because the boiling point changes with altitude, a hypsometer can also help estimate atmospheric pressure or altitude.
Therefore, among the given options, a hypsometer is specifically used for determining the steam point.
Answer:A. steam point