Conversion Factor gc

Acceleration Meters per second squared m/s Eeet per second squared ft/s  

Density Kilograms per cubic meter kg/m Pounds (mass) per cubic foot Ib/ft  

Specific volume Cubic meters per kilogram m /kg Cubic feet per pound (mass) fEdb 

Amount of substance concentration Moles per cubic meter mol/m Pound moles per cubic foot Ibmol/fT 

---

In summary, for engineering systems both F and M can be considered fundamental because of the engineering definition of weight in addition to Newton s second law. However, this results in a redundancy, which needs to be recified by the conversion factor gc. The value of this conversion factor in the various engineering units provides the following identities ... 

It should be noted that a dimensional analysis of this problem results in one more dimensionless group than for the Newtonian fluid, because there is one more fluid rheological property (e.g., m and n for the power law fluid, versus fi for the Newtonian fluid). However, the parameter n is itself dimensionless and thus constitutes the additional dimensionless group, even though it is integrated into the Reynolds number as it has been defined. Note also that because n is an empirical parameter and can take on any value, the units in expressions for power law fluids can be complex. Thus, the calculations are simplified if a scientific system of dimensional units is used (e.g., SI or cgs), which avoids the necessity of introducing the conversion factor gc. In fact, the evaluation of most dimensionless groups is usually simplified by the use of such units. 

The viscosity of Newtonian fluids was defined as the ratio of shear stress to rate of shear r/du/dr (the conversion factor gc being temporarily... 

The units of each term are ft-lbp/lbM, where pound force is Ibp, and pound mass is Ibw- The conversion factor, gc, equals 32.2 IbM-ft/s lbp. In the first term, the kinetic energy term, the factor a corrects for the velocity profile across the... 

Only the American engineering system has four basically defined units. Consequently, in the American engineering system you have to use a conversion factor, gc, a constant whose numerical value is not unity, to make the units come out properly. We can use Newton s law to see what the situation is with regard to conversion of units ... 

A given symbol may represent more than one property. The appropriate meaning should be apparent from the context. The equations given in Sec. 15 reflect the use of the SI or cgs system of units and not ft-lb-s units, unless otherwise noted in the text. The gravitational conversion factor gc needed to use ft-lb-s units is not included in the equations. 

TABLE 1.11 Conversion Factor gc for the Common Unit Systems... 

Note that with U.S. Customary units, the conversion factor gc may be required to make equations in this section dimensionally consistent g = 32.17 (lbm-ft)/lbf-s ). 

Equivalence Among Different Systems, Conversion Factor gc, and Prefixes... 

It should be noted that in equations such as Eq. (6) a conversion factor may be necessary in unit systems that are termed inconsistent. In the US Customary System (uses) the force unit is the lb-force (Ibf) and in SI units the force unit is the Newton (N). The conversion factor gc = 32.174 Ibn... 

Quantitation is performed by the calibration technique. Construct a new calibration curve with methomyl oxime standard solutions (0.2, 0.4, 0.6, 0.8 and 1.0 xgmL in acetone) for each set of analyses. Plot the peak area against the injected amount of methomyl oxime on logarithmic paper. As the amount of alanycarb is measured in terms of its oxime derivative, a conversion factor of 3.8 (the molecular weight ratio of alanycarb to methomyl oxime) should be applied to obtain the net amount. The injection volume should be kept constant as the peak area varies with the injection volume in flame photometric detection. Before each set of measurements, check the GC system by injecting more than one standard solution containing ca 2-10 ng of methomyl oxime. 

The factor gc is the conversion factor that relates equivalent force and mass (ML/t2) units in engineering systems. In these systems both force and mass... 

Since Newton s second law is satisfied identically in scientific units with no conversion factor (i.e., gc = 1), the following identities hold ... 

Note that the conversion factor relating mass units in scientific systems to those in engineering systems can be obtained by equating the appropriate gc values from the two systems, e.g.,... 

Power Number a dimensionless number used to describe the power dissipation of impeller and which is given by NP = Pgc/pN3D5 where P = impeller power dissipation and gc = gravitational conversion factor. 

Table 6.2.4. Conversion factors (C) and GC retention times for the major nitrobenzene and cupric oxide oxidation products of lignins...

Note 10. The conversion factor C includes extraction and derivatization efficiencies and the response factor for the flame ionization detector. The value of C changes when a different GC system is used for the determination and when another compound is used as the internal standard. 

---