1. What is a Vapor Pressure to Temperature Calculator?

Definition: This calculator estimates the temperature corresponding to a given vapor pressure using the inverse Antoine equation.

Purpose: It helps chemists, engineers, and researchers determine the boiling point or phase change temperature for a substance at a specific vapor pressure.

2. How Does the Calculator Work?

The calculator uses the inverse Antoine equation:

Where:

• \( T \) — Temperature (°C)
• \( P \) — Vapor pressure (mmHg)
• \( A, B, C \) — Substance-specific Antoine constants

Explanation: The equation relates the vapor pressure of a substance to its temperature, with constants that are empirically determined for each material.

3. Importance of Vapor Pressure Calculations

Details: Accurate temperature-pressure relationships are crucial for distillation processes, chemical reactions, and predicting phase changes in industrial applications.

4. Using the Calculator

Tips: Enter the vapor pressure in mmHg and the Antoine constants (default values are for water). The pressure must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical Antoine constants for common substances?
A: Water (A=8.07131, B=1730.63, C=233.426), Ethanol (A=8.20417, B=1642.89, C=230.300), Benzene (A=6.90565, B=1211.033, C=220.790).

Q2: What units does this calculator use?
A: Temperature in °C, pressure in mmHg (torr). For other units, convert before calculation.

Q3: What's the valid pressure range?
A: Typically 10-1500 mmHg for most substances, but check your Antoine constants' valid range.

Q4: Can I use this for mixed substances?
A: No, this calculates for pure substances only. Mixtures require more complex calculations.

Q5: Why does my result differ from published values?
A: Check your constants' validity for your temperature range and ensure correct units.