# Why is the triple point significant?

## Why is the triple point significant?

At the triple point, all three phases (solid, liquid, and gas) are in equilibrium. Since the triple point is a point, there is only one temperature and one pressure where the three phases will exist. This fact often helps in identifying compounds or in problem solving.

## What does the triple point tell us?

In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.

Is triple point real?

Scientific definitions for triple point The temperature and pressure at which a substance can exist in equilibrium in the liquid, solid, and gaseous states. The triple point of pure water is at 0.01°C (273.16K, 32.01°F) and 4.58 mm (611.2Pa) of mercury and is used to calibrate thermometers. Compare critical point.

Is triple point unique?

The triple point is suitable because it is unique, i.e., it occurs at one single temperature = 273.15 K and one single pressure of about 0.46 cm of the Hg column. This point is unique because any temperature or pressure higher or lower will change the phase of one or more states of water.

### Which is the best example of a triple point?

Table of triple points Substance T [ K] ( °C) p [ kPa ]* ( atm ) Acetylene 192.4 K (−80.7 °C) 120 kPa (1.2 atm) Ammonia 195.40 K (−77.75 °C) 6.060 kPa (0.05981 atm) Argon 83.8058 K (−189.3442 °C) 68.9 kPa (0.680 atm) Arsenic 1,090 K (820 °C) 3,628 kPa (35.81 atm)

### How are triple point cells used in temperature calibration?

Triple point cells. Triple point cells are so effective at achieving highly precise, reproducible temperatures, an international calibration standard for thermometers called ITS–90 relies upon triple point cells of hydrogen, neon, oxygen, argon, mercury, and water for delineating six of its defined temperature points.

Do you have to include BXD in a triple interaction?

I have a triple interaction: AxBxD, where A and B are continuous variables and D is a dummy. My regression is Y = A + B + AxB + AxD + AxBxD In this case, do I HAVE TO include BxD also?

Can a system be brought to the triple point of water?

Even if the total pressure of a system is well above the triple point of water, provided that the partial pressure of the water vapor is 611.657 pascals, then the system can still be brought to the triple point of water.