Which combination of temperature scales is used in scientific contexts?

• A. Celsius and Kelvin
• B. Fahrenheit only
• C. Rankine only
• D. Celsius, Kelvin, and Rankine

Answer: (D)

In science, temperature is handled on scales that tie to absolute zero and fit different measurement systems. Kelvin is the SI base scale for thermodynamic temperature, giving an absolute reference point. Celsius is convenient for lab work because its key points (0 for melting/freezing, 100 for boiling of water) line up with familiar water properties. Rankine is used in some US engineering and physics contexts when calculations require Fahrenheit-sized increments but still rely on an absolute scale. Because scientific practice uses all of these scales depending on the situation, the combination that best describes scientific usage is Celsius, Kelvin, and Rankine. For reference, conversions include K = C + 273.15 and R = F + 459.67 (or R = K × 1.8).