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ME405: Wet-Dry Bulb Hygrometers: Measuring Relative Humidity and Apparent Temperature
Examples of Student Work
Contributed by: Council of Chief State School Officers (CCSSO)




Event Score = 2



Citation and Explanation
Enhancement Required

"By subtracting 215 from 375. "

Work is shown.
Seems to have an understanding of calibration, but stopped short of completing work.

The student could have done the described calculation, 375 - 215 to get 160. This value (160) then could be used as the correction factor to be added to 212, the actual temperature of the boiling water.

"The actual temperature of the hot gas = 160 F. "

An incorrect value is given as the actual temperature.

Showing the calculation leading to the correct answer or explaning how it is determined, e.g. "212 + 160 = 372 "

Item 2 - Event Score = 2



Citation and Explanation
Enhancement Required
Shown In table 5:

Amt Prec. = 1.4


"When the relative humidity is 98%, it reads 28.30 inches of pressure."

"...it takes clouds to make rain."

"...1.4 inches of rain is only a small bit below the highest. This is how I came to my conclusions."

Only one of the predictions given correlates with data in the table.

Demonstrates some understanding that it is the interaction of factors which determines the weather, but it is at a low level.

The student is mostly using perceived trends in the data to make predictions rather than an understanding of the dependency of factors in determining the weather. Few connections explained.

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