To convert from inches of water (at 4°C) to:
atmospheres,
multiply by .002458.
inches of mercury,
multiply by .07355.
kgs/sq. cm,
multiply by .00254.
ounces/sq. in,
multiply by .5781.
pounds/sq. ft,
multiply by 5.204.
pounds/sq. in,
multiply by .03613.
