Discuss the physical factors in a plastic that affect permeability
What will be an ideal response?
The tightness or denseness of the polymer structure is one of the most important physical factors affecting permeability. Therefore, crystallinity reduces permeability. Likewise, crosslinking reduces permeability. Other factors affecting permeability would be the similarity of chemical natures between the polymer and the gas passing through. If these are similar, permeability is increased. Other factors affecting permeability include temperature (increases permeability) and size of the permeating molecules
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that the proportion of people in the community who have the disease is 0.05.
a. Given that the test is positive, what is the probability that the person has the disease? b. Given that the test is negative, what is the probability that the person does not have the disease?
A standard channel shape having a nominal depth of 8 inches and a weight of 22 pounds per foot would be designated _____.
a. M8 3 22 b. S8 3 22 c. C22 3 8 d. C8 3 22
A _____________________ is a conifer that is evergreen
Fill in the blank(s) with correct word
One type of column used in poured-in-place concrete construction is a ____. These columns are reinforced with long, straight reinforcing bars surrounded by spiral wire or reinforcing bars.
A. tied column B. spiral column C. spliced column D. rectangular column