Match Wits With Our Word Wizards

(Illustrated version of Word Wizards)

e.g. or i.e.?

In each sentence, select the best choice for formal writing:

• Drag is caused by the shuttle's high speed through the very thin atmosphere of space, which results in a force about 1 millionth that of Earth's gravity (i.e. /e.g. , microgravity).
• The compatibility conditions are controller types of relations; that is /i.e., deformations are balanced for finite element discrete analysis.
• This greater range of DLC coating thicknesses led to longer endurance life. For example /e.g., the endurance life of DLC films with a coating thickness of 0.5 mm was about 20 times greater than that of other films with a 0.05-mm-thick coating.
• The generalized input files were used to simulate the cold-test parameters (i.e. /e.g., frequency-phase dispersion, Pierce on-axis interaction impedance, and circuit power attenuation) of two specific circuits. (All the cold-test parameters are enumerated.)
• Lightweight NiAl intermetallic alloys with superior properties (e.g. /i.e., high melting temperature and oxidation resistance) are required for the next generation of high-temperature structural materials. (The parenthetical phrase mentions only two of the properties that will be needed.)
• Experiments have demonstrated that if the thermocapillary driving force (i.e. /e.g., the temperature difference across the free surface) increases beyond a certain critical value, the flow will change from being steady to being oscillatory. (The parenthetical statement explains what the thermocapillary driving force is.)
• A thin interphase layer between the fiber and matrix enables matrix cracks to deflect around the fibers (i.e. /e.g., to perform even when damaged). (The parenthetical phrase explains what happens when such an interphase layer is used.)
• Perfluoropolyethers are used to lubricate many space mechanisms (e.g. /i.e., gyroscopes and filter wheels). (Examples of such mechanisms are given.)

For an explanation of e.g. and i.e. see Quirks of English.