Inch of water, Pressure

Because pressure is commonly measured by its ability to displace a column of liquid in a manometer, pressures are often expressed as a depth of a particular fluid (e.g. inches of water). The most common choices are mercury (Hg) and water; water is nontoxic and readily available, while mercury's density allows for a shorter column (and so a smaller manometer) to measure a given pressure. Read more

I want to convert:

Pressure (symbol: p) is the force per unit area acting on a surface in a direction perpendicular to that surface. Read more