gas fundementals
water one metre high exerts a pressure of?
9.81 kPa
what 2 things affect pressure?
height and density
pressure is described as?
force per unit area
force is defined as...?
a simple push or pull or weight not restricted to area
does shape of container affect the pressure of liquid?
No
if the height of a column of fluid is halved then...?
the pressure is halved
do horizontal runs affect pressure?
no
hydrostatic pressure is the study of what?
fluids under pressure and at rest
water exerts 0.433 psi over one square inch? true or false
true
relative density of mercury is
13.6
a column of mercury 10inches high exerts a pressure of...?
4.91psi
pressure equals what?
height X density
if the height of a column of water is in feet you choose what number to calculate it?
0.433 lb/in^2
1 psi is how much water column?
27.7 or 28W.C
Force is calculated using what triangle?
FAP
should you follow BEDMAS when calculating?
Yes
many gasfitting regulations are designed to permit what?
the forces of the atmosheric pressure to aid in drainage or to prevent backflow in a water distribution system
air is a mixture of what 2 major gases and whats there percentages?
nitrogen 78% and oxygen 21%
atmospheric pressure is considered to be what? (psia, kPa)
14.7psia and 101kPa
Hg is what? (hint its a measurement compared to a certain substance)
Mercury
theres 2 types of barometers what are they
Mercury barometer and Aneroid barmeter
a perfect vacuum is equivalent to??
0psia
whats more dense? water or mercury?
mercury
does matter have weight (Mass)?
yes
how is a compound created?
when atoms of two or more different elements chemically combine
when matter is composed of only one type of atom it is called an?
element
solutions are what?
mixtures in which one substance is dissolved by another evenly so the whole mixture is the same throughout
oxygen dissolving into air or mercaptan into natural gas is...? (compound, Mixture, or solution)
Solution
whats a mixture?
Mixtures are composed of molecules of different materials that have not combined in a way such that no chemical reaction takes place
what metals are an example of a mixture? (just 2 listed)
brass, copper and zinc
when a substance is composed of molecules from two or more different atoms that have chemically combined, it is a...?
Compound
three states of matter
solid, liquid, gas
are able to occupy smaller volume when forced by additional pressure (term)
Compressible
resistance tk shearing or flow (thick like oil) term
viscous
two factors which determine the state of matter are...?
temperature and pressure
Sublimation
soilds going straight from soild to a gas
Latent heat
the amount of heat required to change the state of a substance
changes are divided into two types, what are they
Physical change and chemical change
physical change does not affect the chemical composition of the substance? true or false
True
chemical changes can produce new substances or one with different characteristics? true or false
True
Water volume increases by .... times when turning from water to steam
1700
Adhesion (definition)
is the force exerted by the attraction of different molecules to each other
Cohesion (definition)
is the force attraction between like molecules
Capillarity (calillary action ability)
is the ability lf a liquid to rise or drop in small tubes
soldering uses what
capillarity action
density is
is the mass of a substance per unit volume
density of water is (hint kg/m^3 or lb/ft^3)
1000kg/m^3 and 62.4lb/ft^3
the mass of 4 cubic feet of water is....(imperial)
249.6 pounds
the mass of 4 cubic meters of water is (metric)
4000kg
substances usually expand when heated, causing there volume to increase while their density decreases with water being an exception to this rule. true or false
true
airs density in imperial
0.076 lb/ft^3
airs density in metric
1.29 kg/m^3
waters density in imperial
62.4 lb/ft^3
waters density in metric
1000kg/m3
density is the relationship of the mass of a substance to its .....
Volume
air has a relative density of
1
methane has has a relative density of
0.6
propane gas has a relative density of
1.5
propane liquid has a relative density of
0.5
water has a relative density of
1
relative density is the same in either measuring system, metric or imperial true or false?
True
volume x density gets you what?
buoyant force available
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