Flashcards in Ch. 6: What is Water and Where Does it Come From? Deck (134)
What by far, remains the most commonly used fire extinguishing agent?
What is water considered for all practical purposes?
What abilities does water have to extinguish a fire?
cooling, absorbing heat from the fire; smothering, excluding oxygen
What govern the heat-absorbing ability of water?
specific heat and latent heat of vaporization
What is a measure of the heat-absorbing capacity of a substance?
What is the amount of heat required to raise the temperature of 1 pound of water 1 degree F?
What is the ratio between the amount of heat needed to raise the temperature of a specified quantity of a material and the amount of heat needed to raise the temperature of an identical quantity of water by the same number of degrees?
specific heat of any substance
Water absorbs ______ times as much heat as does an equal amount of carbon dioxide.
What is the quantity of heat absorbed by a substance when it changes from a liquid to a vapor?
latent heat of vaporization
What is the temperature at which a liquid absorbs enough heat to change to vapor known as?
At its boiling point of 212 degrees F, water expands approximately how much its original volume?
What is the tendency of a liquid to possess internal resistance to flow?
What is the density of liquids in relation to water known as?
What is defined as force per unit area?
What is a simple measure of weight and is usually expressed in pounds or kilograms?
What is the weight of 1 cubic foot of water?
What is the speed at which fluid travels referred to as?
What is considered standard atmospheric pressure?
At sea level, 14.7 psi
What is any pressure that is less than atmospheric pressure called?
What is absolute zero pressure called?
a perfect vacuum
What misnomer do gauge readings of less than 0 psi or kPa often referred to in the fire service?
What is referred to the height of a water supply above the discharge orifice?
What is the stored potential energy available to force water through pipe, fittings, fire hose, and adapters?
What is the pressure in a water system before water flows from a hydrant considered as?
What is pressure found in a water distribution system during normal consumption demands?
normal operating pressure
What is that part of the total available pressure not used to overcome friction loss or gravity while forcing water through pipe, fittings, fire hose, and adapters?
What means a remainder or that which is left?
What that forward velocity pressure at a discharge opening while water is flowing?
What refers to the center line of the pump or the bottom of a static water supply source above or below ground level?