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Review
Chapter 2 and 3
Upon studying this section, you should be familiar with the following:
- How to deal with unit conversions, temperature conversions, pressure
relations, densitiy relations, concentrations, mole fractions, and flow rates.
- Be comfortable with concentrations, and know the molarity formula, Molarity of A = Moles of A / Total Mixture Volume in Liters
- Be comfortable with mass and mole fraction notation, x is used for
liquids and solids, y is used for gases:
xA, or yA =
mA / mtotal or
nA / ntotal or
mdotA / mdottotal or ndotA /
ndottotal
Also, know formulas for
ppm and ppb, where
ppm = xA, or yA * 106 and ppb = xA, or yA *
109
- Lastly, understand the flow rate notation, such as mdot,
ndot, Vdot, etc,
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Explanation:
Here, the material from chapters two and three is reveiwed. Note, this
is just a list of some interrelations, the only way to really review is to
exercise your problem solving skills by working examples.
- Know how to convert units, in particular, some easily confused units
are lbf verse lbm and g-moles verse lb-moles.
- Know the relation between gauge pressure and absolute
pressure.
Pabs = Pgauge +
Patm
- Know the following relation for the pressure of a liquid or
solid:
Pi = ρigh
- Know the relationship between specific gravity and density for a
liquid or solid, which is as follows at STP.
ρ = SGi in g/ml
- Know the following relationship for the density of a liquid or
solid:
ρ = mass / volume
- Be able to perform static pressure problems, such as pressure
balances on manometers.
- Know the following temperature conversions.
Converting Temperature
| Interrelation |
Formula |
| Celsius & Fahrenheit |
T(°F) = 1.8 * T(°C) + 32 |
| Kelvin & Celsius |
T(°K) = T(°C) + 273.15 |
| Kelvin & Rankine |
T(°R) = 1.8 * T(°K) |
| Rankine & Fahrenheit |
T(°R) = T(°F) + 459.67 |
Converting Temperature Changes
| Interrelation |
Formula |
| Celsius & Fahrenheit |
ΔT(°F) = 1.8 * Δ T(°C) |
| Kelvin & Celsius |
ΔT(°K) = ΔT(°C) |
| Kelvin & Rankine |
ΔT(°K) = 1.8 *ΔT(°R) |
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