The temperature of media post sterilization drops from 100°C to 60°C in 40 min by simply keeping it on the lab bench and allowing slow atmospheric…
The temperature of media post sterilization drops from 100°C to 60°C in 40 min by simply keeping it on the lab bench and allowing slow atmospheric cooling to take place at an ambient temperature of 20°C. In the next 40 min, the approximate temperature (°C) of the media would be around
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Correct Answer: Option A
Explanation
Newton's Law of Cooling states:, whereis the cooling constant. The solution is. With: At:(excess = 80°C above ambient). Atmin:(excess = 40°C — halved). So the excess temperature halves every 40 min. Atmin: excess = 20°C →. The media would be approximately 40°C after the next 40 minutes.