The following choices are correct relating to temperature:
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We measure temperature in °C, °F or K - This is correct as temperature can be measured in degrees Celsius (°C), degrees Fahrenheit (°F), or Kelvin (K).
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Temperature is the average kinetic energy of a substance. - This is also correct. Temperature is indeed a measure of the average kinetic energy of the particles in a substance.
The other statements are not correct:
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Fahrenheit is the most reliable measure of temp. - This statement is subjective and generally not considered accurate. Celsius and Kelvin are often used in scientific contexts, making them more reliable in those situations.
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Solids have less kinetic energy than liquids and therefore (usually) lower temperature. - While it is generally true that solids have less kinetic energy than liquids, this does not necessarily mean they are at a lower temperature. Temperature is more about the average kinetic energy than simply being in a solid or liquid state.