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The surface of glass quickly develops very small microcracks when exposed to high humidity. Although microcracks can be safely ignored in most applications, they can significantly decrease the mechanical strength of very small glass structures such as optical fibers. Consider a glass optical fiber of diameter Di = 125 µm that is coated with an acrylate polymer to form a coated fiber of outer diameter Do = 250 µm.
A telecommunications engineer insists that the optical fiber be stored in a low-humidity environment prior to installation so that it is sufficiently strong to withstand rough treatment by technicians in the field. If installation of a roll of fiber requires several hot and humid days to complete, will careful storage beforehand prevent microcracking? The mass diffusivity of water vapor in the acrylate is DAB = 5.5 X 10-13 m2/s while the glass can be considered impermeable.
a rigid tank is divided into two equal parts by a partition. one part of the tank contains 9.2 kg of compressed liquid
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Ten pounds-mass of R-22 is at an initial volume of 4.059 ft3 and pressure of 200 psia. It is compressed isobaric ally until its volume is two-thirds of its initial volume. The piston is then held in place as the refrigerant cools until its temperatur..
two large well-insulated tanks of 2m diameter and 5m in height are filled with air. one tank is initially at 1bar and
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