Which of the following statements concerning the three major temperature scales is incorrect?
a. Kelvin scale temperatures can never have negative values.
b. A Celsius degree and a Kelvin are equal in size.
c. The addition of 273 to a Fahrenheit scale reading will convert it to a Kelvin scale reading.
d. The freezing point of water has a lower numerical value on the Celsius scale than on the Fahrenheit scale.