CHE-06

Antoine vapour pressure

log10 P = A − B/(T+C) with T in °C, P in mmHg.

Reading speed

VLEAntoine 1888

Governing equation

\log_{10} P = A-\dfrac{B}{T+C}

where

A: Antoine A (—)
B: Antoine B (—)
C: Antoine C (—)
T: Temperature (°C)
P: Vapour pressure (mmHg)
P: Vapour pressure (kPa)

Lecture brief

Historical brief

From CSTR/PFR mole balances and Arrhenius rates to McCabe–Thiele stages and NTU exchangers, chemical engineering is conservation plus equilibrium. The lab is that design arithmetic. This sheet (CHE-06 — Antoine vapour pressure) is the form associated with Antoine 1888. Working symbols: $A$ , $B$ , $C$ , $T$ $\rightarrow$ $P$ , $P$ . Antoine fitted a three-parameter rearrangement of Clausius–Clapeyron that remains the plant-data standard for pure-component vapour pressure.

Purpose

Purpose: compute

P

P

from

A

B

C

T

in Chemical engineering via

\log_{10} P = A-\dfrac{B}{T+C}

log10 P = A − B/(T+C) with T in °C, P in mmHg. Use it when a real chemical engineering question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given

A = 8.071\,\mathrm{—}

B = 1730.630\,\mathrm{—}

C = 233.426\,\mathrm{—}

T = 80.000\,\mathrm{^{\circ}C}

, the governing relation

\log_{10} P = A-\dfrac{B}{T+C}

yields

P = 354.532\,\mathrm{mmHg}

P = 47.267\,\mathrm{kPa}

. Water-like defaults (A,B,C). Range of fit must be respected. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Antoine A A8.07131 —Antoine B B1730.63 —Antoine C C233.426 —Temperature T80 °C

Outputs

Vapour pressure P354.532 mmHg
Vapour pressure P47.267 kPa

Reading speed

Watch on YouTube

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Narration of this film

Water-like defaults (A,B,C). Range of fit must be respected.

Antoine fitted a three-parameter rearrangement of Clausius–Clapeyron that remains the plant-data standard for pure-component vapour pressure.

Reading speed

Watch on YouTube