Which scale is being described? water freezes at 32 . water freezes at 0 . water freezes at 273 .

In Fahrenheit scale water freezes at 32°. In Celsius scale water freezes at 0°. and kelvin scale water freezes at 273.

Three most commonly  used temperature scale are Celsius scale, Fahrenheit scale and kelvin scale. The freezing point and boiling point of water on Celsius scale are 0° C and 100°C at sea level. The freezing point and boiling point of water on Fahrenheit scale are 32° F and 212°F at sea level. The freezing point and boiling point of water on kelvin scale are 273 K and 373 K at sea level.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.