For water to be a liquid, its temperature must be within 50 Kelvin of 323 Kelvin. Which equation can be used to determine the minimum and maximum temperatures between which water is a liquid?
Answer
A
start absolute value x plus 323 end absolute value is equal to 50
B
start absolute value x minus 323 end absolute value is equal to 50
C
start absolute value 323 plus 50 end absolute value is equal to x
D
start absolute value 323 minus 50 end absolute value is equal to x
Explanation
“Within 50 Kelvin of 323 Kelvin” means the temperature x can differ from 323 by 50 Kelvin. The distance between the temperatures is written as |x − 323|, so setting that distance equal to 50 gives |x − 323| = 50. Solving gives x = 273 K and x = 373 K, the minimum and maximum temperatures.
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