Q.At a triple point
(a) Both the temperature and pressure are fixed
(b) Only the temperature is fixed
(c) Only the pressure is fixed
(d) Sometimes pressure and sometime temperature is fixed
Answers
Answer:
The pressure of a given amount of gas is directly proportional to the temperature at aTriple-point has a unique temperature; fusion point and boiling point temperatures depend on pressure.
(b) The other fixed point is the absolute zero itself.
(c) Triple-point is 0.01
o
C, not 0
o
C.
(d) T=273.15×9/5=491.69
The temperature and pressure at which a substance can exist in equilibrium in the liquid, solid, and gaseous states.It is unique and constant. The problem with Celsius scale is that boiling and melting point change with atmospheric pressure at that place. given volume. When the temperature of a system goes up, the pressure also goes up, and vice versa. The relationship between pressure and temperature of a gas is stated by the Gay-Lussac's law.
As well as the boiling or melting point of a substance, the triple point of a substance can be use as a fixed point. This is the temperature at which that substance exists in its solid, liquid and gaseous state all at the same time.