What is the Joule-Thomson Coefficient?

The Joule-Thomson coefficient (μ_JT) measures the change in temperature of a gas per unit change in pressure during a throttling process (constant enthalpy). It’s calculated as:

μ_JT = (∂T/∂P)_H

Meaning of the Output:

• Positive μ_JT: Temperature decreases as pressure drops (cooling effect, e.g., refrigeration).
• Negative μ_JT: Temperature increases as pressure drops (heating effect).
• Zero μ_JT: No temperature change (inversion point).

Units: K/Pa (SI). Typical values are small, often requiring scientific notation (e.g., 10⁻⁵ K/Pa).