of the eddy-mass diffusivity will be very much larger than the molecular diffusivity in the turbulent core.
2. Fluid dynamics
- In fluid dynamics, an eddy is the swirling of a fluid and the reverse current created when the fluid flows past stir bar. This phenomenon is most visible behind large objects in swift-flowing fluids. The concept of eddy is often used in turbulence flow.
With and w
19. A law summarizes what happens, e.g., law of conservation of mass in a chemical reaction or
the ideal gas law, PV = nRT. A theory (model) is an attempt to explain why something
happens. Dalton’s atomic theory explains why mass is conserved in a chemical reaction. The
kinetic molecular theory explains why pressure and volume are inversely related
1-7E The weight of a man on earth is given. His weight on the moon is to be determined.
Analysis Applying Newton's second law to the weight force gives lbm 5.210lbf 1ft/slbm 174.32ft/s 10.32lbf 21022=⎟⎟⎠⎞⎜⎜⎝⎛⋅==⎯→⎯=gWmmgW
Mass is invariant and the man will have the same mass on the moon. Then, his weight on the moon will be
lbf 35.8=⎟⎠⎞⎜⎝⎛⋅==22ft/slbm 174.
1. Various geometric formulas are given in Appendix E.
(a) Expressing the radius of the Earth as
R = (6.37 × 106 m)(10−3 km m) = 6.37 × 103 km,
its circumference is s = 2π R = 2π (6.37 × 103 km) = 4.00×104 km.
(b) The surface area of Earth is ( )A = 4π R2 = 4π 6.37 × 103 km 2 = 5.10 × 108 km2.
(c) The volume of Earth is ( )4 3 4 6.37 103 km 3 1.08 1012 km3.
◆ Modern Society and Web 2.0
Web 1.0 era as the word of "sea of information", we are exposed to a lot of information. Regardless of distance and time, we can easily send information as well as our own private information. Also, the amount of data, in 1989, the European Particle Physics in Switzerland, developed hypertext and MOSAIC invented first web browser in 1993. Those changes helped to