# How high could a weather balloon be used on Mars without rupturing? [duplicate]

What is the maximum height could a weather balloon achieve on Mars without rupturing?

Assume that the balloon is adapted for Mars' atmosphere and gravity from standard high altitude balloons used on Earth.

• I think "What advantages would a weather balloon provide over a rover?" is a totally different question, the obvious answer is that a rover would make a terrible weather balloon. Why not ask "what advantages and practical limitations would lighter than air craft have over rovers for explanation on Mars?" separately?
– uhoh
Mar 20 '19 at 2:48
• Why the tag rovers? A rover and a balloon are two very different things. If a balloon is filled with very little gas so that its pressure in a vacuum is well below its burst pressure, it would not rupture. But this balloon would never reach vacuum when started from the surface. Remember the balloon satellite Echo in Earth orbit long ago.
– Uwe
Mar 20 '19 at 12:04
• If the balloon includes a pressure-relief valve, it won't rupture, no matter how high it goes. The real question is how high can a balloon go in the Martian atmosphere? I.e.at what altitude does the air it displaces weigh the same as the balloon? Mar 20 '19 at 12:46
• Be back on the Electronics SE tomorrow! :-) Mar 20 '19 at 17:38
• @uhoh I'd even ask, why place one most highest altitude atmospheric balloon in mars atmosphere, when you can stay orbital, LMO or GMO, and save speed, fuel/mass, velocity changes, avoid atmospheric disturbances and instruments related incaccuracies. Mar 25 '19 at 23:28

• @JMac Yes, p = 699 * e^(−0.00009∗ℎ) according to NASA or h = -11111 * ln(p/699) (in Pascals and meters). That puts 290 Pa (2.9 mbar) at a bit under 10km. The answer isn't far off. Mar 21 '19 at 17:02