On Saturday, December 6, 2014 2:59:38 PM UTC-8, Dave Nadler wrote:
On Saturday, December 6, 2014 12:27:42 AM UTC-5, krasw wrote:
... variometer does not care about the absolute pressure.

Really? What happens at 10,000 feet vs. sea level?
Discuss amongst yourselves...

Well, let's see. The air is less dense at 10,000 MSL than it is at sea level. One formula for force is F = ma. This suggests the air flow through the variometer would produce less force at 10,000MSL than
it would at sea level. If the variometer is a vane-type variometer perhaps the variometer vane would not be moved as much at 10,000 MSL than it would be at sea level. So... the variometer would read less lift/drag at 10,000 MSL than it would at sea level? Just a guess. I really have no idea.