Glossary

Terms and Units

Terms

• Mach 2 = twice the speed of sound
• Spoil = generic term for excavated material

Units

• lbs = pounds
• lbf = pounds force
• lbm = pounds mass
• cfm = cubic feet per minute
• scfm = standard cubic feet per minute
• psi = pounds per square inch
• psig = pounds per square inch gauge
• in = inch
• cu in = cubic inches
• in Hg = inches of mercury
• in H2O = inches of water
• ft = feet
• cu ft = cubic feet
• cu yd = cubic yards
• gal = gallons
• gpm = gallons per minute
• oz = ounces
• °F = degrees Fahrenheit
• °C = degrees Celsius