Physics Temperature questions:Question #1 How does the temperature of a tub of hot water as measured by a thermometer differ from the water's temperature before the measurement is made? Multiple...

Physics Temperature questions:

Question #1

How does the temperature of a tub of hot water as measured by a thermometer differ from the water's temperature before the measurement is made? Multiple Choice either A or B.

A)The water's temperature was higher before measurement.

B)The water's temperature was lower before measurement.

Question #2

What property of a thermometer is necessary for the difference between these two temperatures to be minimized? Multiple Choice either A or B.

A) No property can be adjusted to avoid a significant difference between these two temperatures.

B)The length, rather than mass of the thermometers should be decreased.

1 Answer | Add Yours

bandmanjoe's profile pic

bandmanjoe | Middle School Teacher | (Level 2) Senior Educator

Posted on

If you have a certain temperature of the hot water, existing while the water is in the tub, that temperature will most certainly decrease when you insert the thermometer to measure the temperature of the water.  The glass of the thermometer will absorb at least one to two degrees of temperature, resulting in a lower reading on the temperature of the water.  I would pick "A" for number 1.

On question number two, process of elimination will take out choice "A", as it tends to suggest nothing can be done to take into account the heat absorption qualities of glass in the thermometer.  If you know for a fact glass will absorb heat, and more importantly, specifically how much heat, adjustments should be calculated and made.  That leaves answer choice "B", which is the better pick of the two.  You can certainly decrease the length of the thermometer you insert into the water; it would be harder to decrease the amount of mass the thermometer has.

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