Pressure altitude is used to determine your aircraft’s performance in non-standard conditions, which are any time the barometric pressure is anything other than 29.92 Hg at sea level.

You may have heard a flight attendant talk about the safety procedures to follow if the cabin loses pressure, but what does ...

The conditions outside a cruising airliner are those of intense cold, thin air, and potentially lethal atmospheric conditions ...

But the tire pressure warning light doesn’t even come on until your pressure drops by around 10%. So, in your case, you’d have to lose more than 3 psi to get even a warning from the system.

Most measurably, as altitude increases, air becomes less dense, decreasing atmospheric pressure. Standard altitude-pressure tables allow mountaineers and aviators to determine their approximate ...

He calculates altitude based on pressure. The main parts are an Arduino Pro Mini clone, a BMP180 sensor and a Nokia 5110 LCD module. A standard 9V battery supplies juice to the device.