The document discusses the triple point of substances, which is the specific temperature and pressure at which the solid, liquid, and gas phases of a single substance can coexist in equilibrium. It provides the triple point values for water, which is 0.01°C and 611.73 pascals, as well as table listing the triple point temperatures and pressures of various substances including helium, hydrogen, oxygen, nitrogen, ammonia, and carbon dioxide.

1. Triple Point
Prepared by: supervised by :
Ramyar Tahir Mr.Jaffer

2. Definition:
:
Triple Point is the temperature and pressure at
which solid, liquid, and vaporphases of a particular
substance coexist in equilibrium. A specific case
of phase equilibrium.

4. Zeroth Law Of Thermodynamics
To recall, the zeroth law of thermodynamics states
that two bodies in thermal equilibrium with a third
are in thermal equilibrium with each other. In other
words, two bodies in thermal equilibrium have the
same temperature, and we can use a third body, a
thermometer, to find this temperature

5. Triple point of Co2

6. Triple points of water

7. The single combination of pressure and temperature at
which liquid water, solid ice, and water vapour can
coexist in a stable equilibrium occurs at exactly
273.16 K (0.01 °C) and a partial vapour pressure of
611.73 pascals (ca. 6.1173 millibars, 0.0060373atm). At
that point, it is possible to change all of the substance
to ice, water, or vapour by making arbitrarily small
changes in pressure and temperature.

8. Substance
Temperature
K
Pressure
105Pa
Helium-4 (l-point) 2.17 0.0507
Hydrogen 13.84 0.0704
Deuterium 18.63 0.171
Neon 24.57 0.432
Oxygen 54.36 0.00152
Nitrogen 63.18 0.125
Ammonia 195.40 0.0607
Sulfur dioxide 197.68 0.00167
Carbon dioxide 216.55 5.17
Triple Point Data

9. Other triple points of water at high pressure