Viscosity is a measure of a fluid's resistance to flow. So it is a measure of the liquid's ability to flow. The units of viscosity are poise (P), 1P= 1 g/cm.s. Sometimes N.s/m2 is also used. The factors affecting viscosity include - molar mass, shape, length and temperature TABLE 11.6 Viscosity of Liquid Water at Several Temperatures TABLE 11.5 Viscosity of Several Hydrocarbons at 20 °C Hydrocarbon Molar Mass (9/mol) Formula Viscosity (cP) Temperature ("C) Viscosity (CP) N-Pentane 72.15 CH,CH,CH,CH,CH, 0.240 N-Hexane 86.17 1.002 CH,CH;CH,CH,CH,CH, CH,CH,CH,CH,CH,CH,CH, CH,CH,CH,CH;CH,CH;CH;CH, 0.326 20 N-Heptane 100.2 40 0,653 0.409 N-Octane 114.2 60 0,467 0,542 N-Nonane 128.3 CH,CH,CH,CH,CH,CH,CH,CH,CH, 80 0.355 0.711 Copyright © 2008 Pearson Prentice Hall, Inc. 100 0.282 How is the viscosity of the substance related to its molar mass? How is the viscosity of the substance related to temperature? Explain this effect. Explain this effect.
Viscosity is a measure of a fluid's resistance to flow. So it is a measure of the liquid's ability to flow. The units of viscosity are poise (P), 1P= 1 g/cm.s. Sometimes N.s/m2 is also used. The factors affecting viscosity include - molar mass, shape, length and temperature TABLE 11.6 Viscosity of Liquid Water at Several Temperatures TABLE 11.5 Viscosity of Several Hydrocarbons at 20 °C Hydrocarbon Molar Mass (9/mol) Formula Viscosity (cP) Temperature ("C) Viscosity (CP) N-Pentane 72.15 CH,CH,CH,CH,CH, 0.240 N-Hexane 86.17 1.002 CH,CH;CH,CH,CH,CH, CH,CH,CH,CH,CH,CH,CH, CH,CH,CH,CH;CH,CH;CH;CH, 0.326 20 N-Heptane 100.2 40 0,653 0.409 N-Octane 114.2 60 0,467 0,542 N-Nonane 128.3 CH,CH,CH,CH,CH,CH,CH,CH,CH, 80 0.355 0.711 Copyright © 2008 Pearson Prentice Hall, Inc. 100 0.282 How is the viscosity of the substance related to its molar mass? How is the viscosity of the substance related to temperature? Explain this effect. Explain this effect.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Viscosity**
Viscosity is a measure of a fluid’s resistance to flow. It is a measure of the liquid’s ability to flow. The units of viscosity are poise (P), where 1P = 1 g/cm·s. Sometimes N·s/m² is also used.
The factors affecting viscosity include molar mass, shape, length, and temperature.
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**Table 11.5: Viscosity of Several Hydrocarbons at 20 °C**
| Hydrocarbon | Molar Mass (g/mol) | Formula | Viscosity (cP) |
|-------------|--------------------|--------------------------|----------------|
| N-Pentane | 72.15 | CH₃(CH₂)₃CH₃ | 0.240 |
| N-Hexane | 86.17 | CH₃(CH₂)₄CH₃ | 0.326 |
| N-Heptane | 100.2 | CH₃(CH₂)₅CH₃ | 0.409 |
| N-Octane | 114.2 | CH₃(CH₂)₆CH₃ | 0.542 |
| N-Nonane | 128.3 | CH₃(CH₂)₇CH₃ | 0.711 |
**Table 11.6: Viscosity of Liquid Water at Several Temperatures**
| Temperature (°C) | Viscosity (cP) |
|------------------|----------------|
| 20 | 1.002 |
| 40 | 0.653 |
| 60 | 0.467 |
| 80 | 0.355 |
| 100 | 0.282 |
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**How is the viscosity of the substance related to its molar mass?**
*Explain this effect.*
**How is the viscosity of the substance related to temperature?**
*Explain this effect.*
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