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Dermatologists often remove small precancerous skin lesions by freezing them quickly with liquid nitrogen, which may have a temperature as low as 77.3 k. what is this temperature on the (a) celsius and (b) fahrenheit scales

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Dejanras
Answer is: -195,85°C and -320,53F.
1) The temperature in degrees Celsius (°C) is equal to the temperature in Kelvin (K) minus 273.15:
T(°C) = T(K) - 273.15 = 77,3K - 273,15 = -195,85°C.
2) The temperature in degrees Fahrenheit (°F) is equal to the temperature in Kelvin (K) times 9/5, minus 459.67:
T(°F) = T(K) · 9/5 - 459.67 = 77,3K · 1,8 - 459,67 = -320,53°F.