We use this information to address the inquiry and respond to the question. ![]() To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including: Questions and Inquiriesįor inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. Please note that other Pearson websites and online products and services have their own separate privacy policies. This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site. What are its density, viscosity, and kinematic viscosity in SI units? The density of 35 ° API crude oil is 53.1 lb m/ft 3 at 68 ☏, and its viscosity is 32.8 lb m/ft hr. Table 1.11 Commonly Used Conversion Factors The solution is obtained by employing conversion factors taken from Table 1.11: Some of the more frequently used conversion factors are given in Table 1.11. Table 1.10 Prefixes for Fractions and Multiples Note also, for example, that 1 μkg should be written as 1 mg-one prefix being better than two. For example, to avoid an excessive number of decimal places, 0.000001 s is normally better expressed as 1 μs (one microsecond). Table 1.10 shows some of the acceptable prefixes that can be used for accommodating both small and large quantities. Note that the basic SI unit of mass (kg) is even represented in terms of the gram and has not yet been given a name of its own! Table 1.9 Auxiliary Units Allowed in Conjunction with SI Units Tradition dies hard, and certain other “metric” units are so well established that they may be used as auxiliary units these are shown in Table 1.9. Some of the units have names, and these, together with their abbreviations, are also given in Table 1.8. ![]() Force (kg m/s 2) has already been discussed energy is the product of force and length power amounts to energy per unit time surface tension is energy per unit area or force per unit length, and so on. The basic units are again the meter, kilogram, and second (m, kg, and s) from these, certain derived units can also be obtained. The most systematically developed and universally accepted set of units occurs in the SI units or Système International d’Unités 6 the subset we mainly need is shown in Table 1.8. If the reader is in any doubt, units should always be checked when performing calculations. Why not, for example, also incorporate the conversion factor of 144 in 2/ft 2 into equations where pressure is expressed in lb f/in 2? We prefer to omit all conversion factors in equations and introduce them only as needed in evaluating expressions numerically. Some writers incorporate g c into their equations, but this approach may be confusing, since it virtually implies that one particular set of units is being used and hence tends to rob the equations of their generality. When using lb f in the ft, lb m, s (FPS) system, the following conversion factor, commonly called “g c,” will almost invariably be needed: Instead, the pound force, lb f, is much more common in the English system it is defined as the gravitational force on 1 lb m, which, if left to fall freely, will do so with an acceleration of 32.2 ft/s 2. The poundal is now an archaic unit, hardly ever used. Table 1.7 gives the corresponding units of force in the SI (meter/kilogram/second), CGS (centimeter/gram/second), and FPS (foot/pound/second) systems. Newton’s second law of motion states that a force F applied to a mass M will give it an acceleration a:įrom which is apparent that force has dimensions ML/T 2. For much of this book, these values are simply taken as 32.2, 9.81, and 981, respectively. Mostly, we shall be discussing phenomena occurring at the surface of the earth, where g is approximately 32.174 ft/s 2 = 9.807 m/s 2 = 980.7 cm/s 2. ![]() On the other hand, the weight w of the object is the gravitational force on it and is equal to Mg, where g is the local gravitational acceleration. The mass M of an object is a measure of the amount of matter it contains and will be constant, since it depends on the number of constituent molecules and their masses. Learn More Buy 1.5 Units and Systems of Units ![]() Fluid Mechanics for Chemical Engineers: with Microfluidics, CFD, and COMSOL Multiphysics 5, 3rd Edition
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