Defined the following as used in the calibration of a thermometer; (1) Fixed point (2) Lower fixed point (3) Upper fixed point 😘🌹🥰🎉

Let's define these terms for thermometer calibration:

1. Fixed point

   • A fixed point is a specific, reproducible temperature used as a reference for calibrating thermometers. These points are based on the phase transitions of pure substances, such as the melting point of ice or the boiling point of water, which occur at constant temperatures under standard atmospheric pressure.

2. Lower fixed point

   • The lower fixed point is the temperature at which pure ice melts into water under standard atmospheric pressure (1 atmosphere or 760 mmHg). On the Celsius scale, this is defined as 0 °C.

3. Upper fixed point

   • The upper fixed point is the temperature at which pure water boils into steam under standard atmospheric pressure (1 atmosphere or 760 mmHg). On the Celsius scale, this is defined as 100 °C.