How to Calculate Jeans Escape
What is Jeans Escape?
Jeans escape describes atmospheric loss when molecular thermal velocity exceeds planet escape velocity, particularly important for light elements.
Step-by-Step Guide
- 1Input planet mass/radius, atmospheric temperature and composition
- 2Calculate escape velocity and thermal velocity
- 3Estimate atmospheric escape timescale
Worked Examples
Input
Earth H/He at 6000K exosphere
Result
H escapes easily, He slowly, O/N retain
Why Earth lost primordial atmosphere
Common Mistakes to Avoid
- ✕Neglecting temperature gradient with altitude
- ✕Assuming steady escape rate
Frequently Asked Questions
Does Mars still lose atmosphere?
Yes, slowly; weak gravity and solar wind accelerate loss.
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