To oonvert poises to pasoal-seoonds, multiply by 0.1. 2-32 Nomograph for determining (n) absolute viseosity of a gas as a fnnotion of temperature near ambient pressure and (b] relative viseosity of a gas compared with air. Nomograph for Determining a) Absolute Viscosity of a Gas as a Function of Temperature Near Ambient Pressure and (h) Relative Viscosity of a Gas Compared. Viscosities of Gases Coordinates for Use with Fig. (Reprinted from with permission of ASM International). 6 Dew-point nomograph that correlates pressure, temperature, and water content (As shown, at 1.0 atm tmd 0☌, the dew point is 6,(XX) ppm of water).
Depriester chart dew temperature how to#
How to use the nomograph Assume a reported boiling point of 120 ☌ at 2 torr. Pressure-temperature alignment nomograph ( dashed lines added for illustrative purposes). To determine the boiling point at 18 mm, connect 100☌ (column A) to 1 mm (column C) with a transparent plastic rule and observe where this line intersects column B (about 280☌). How to use the nomograph Assume a reported boiling point of 100☌ (column A) at 1 mm. Pressure-temperature alignment nomograph. 10 Pressure-temperature OBSERVED nomograph. Identify the acid from the list in Appendix A, Table 9W.1. Using the pressure-temperature nomograph on page 49, determine its boiling point at 760 torr. Īn unknown carboxylic acid has a boiling point of 100 ☌ at 25 torr.
Conversely, a substance observed to boil at 50☌ (Column A) at 1.0 mm Hg (Column C) will boil at approximately 212☌ at atmospheric pressure (Column B).
If the boiling point of a substance at 760 mm Hg is known, e.g., 300☌ (Column B), and the new pressure measured, e.g., 10 mm Hg (Column C), then a straight line connecting these values on Columns B and C when extended intersects Column A to give the observed bp of 160☌. The boiling point of a substance at various pressures can be estimated from a pressure-temperature nomograph such as the one shown in Fig. The reduction in the boiling point will depend on the eduction in pressure and it can be estimated from a pressure-temperature nomograph (Fig. In this situation it may be possible to avoid thermal decomposition by carrying out the distillation at reduced pressure. Many compounds decompose when heated to their boiling points so they cannot be distilled at atmospheric pressure. Light-Hydrocarbon Vapor- Liquid Distribution Coefficients, Pressure-Temperature-Composition Charts and Pressure-Temperature Nomographs Chem. Line up point B figured in step 3 with another pressure (chart C) Įxtend the line BC through chart A to approximate the corresponding b.p. The line drawn from point A to C intersects chart B to give the theoretical b.p.
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