Temperature is a measure of the average kinetic energy of the particles that make up a substance. Because it is not possible to measure the kinetic energy of individual particles of a substance and take the average, a thermometer is used to measure temperature. The following diagram shows the comparison between the various scales commonly used to measure temperature.
Scientists worldwide use the Celsius scale. It is based on the properties of water, and the unit for it is degrees Celsius, written as °. On the Celsius scale, water freezes at 0° and boils at 100°. Kelvin is the SI unit of temperature, written as K. Absolute zero, 0 K, which is equivalent to −273°, is the lowest temperature possible for any substance. The Fahrenheit scale is commonly used in the United States for weather reports and to measure temperatures indoors. The unit is degrees Fahrenheit, written as °F. To convert between Fahrenheit and Celsius scales, any temperature y°F is converted to the temperature x° with the following equation:

\(y^oF = \frac{9}{5} x^oC + 32\)

At what temperature on the Fahrenheit scale does water boil?

C. +212°


Plug x = 100 into the given formula, since water boils at 100oC. After solving the formula you will find out water also boils at 212oF. Choice C is correct


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