linearly

first slowly and then steeply

first steeply and then gradually

unpredictable

Bourdon tube

Pirani Gauge

micro-manometer

ionisastion gauge

gas law

Boyle′s law

Charle′s law

Pascal′s law

1

1.2

0.8

0.75

decreases linearly with elevation

remains constant

varies in the same way as the density

increases exponentially with elevation