What's a "mill"? Do you mean millimeters? If so, 100 mm is about 4 inches; if you need a more accurate answer, there are 25.4 mm per inch and you can do the necessary division yourself.
29.92 inches of mercury = ~406.78 inches of water.
75 millibars = 30.1 inches of water.
100mill
6 inches of water No 6 inches of water can cause you to loose traction and hydroplane but 24 inches of water is needed to actually float the car
1.25 inches of water = 2.335 mmHg
27.7 inches
There are 17.66 gallons in 4,080 cubic inches of water.
0.25 psig = 413.7 inches of water column
On average we get 47.5 inches annually.
25,773
5 to20 inches of water
8 inches of water are needed to shift a caryes amazing isn't it.