Pure water freezes and ice melts at a standard temperature of_________?
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Answer: A. 00C
Explanation
Pure water freezes and ice melts at a standard temperature of zero degrees Celsius. This thermal benchmark defines the freezing point under normal atmospheric pressure conditions. Phase changes between solid ice and liquid water occur precisely at this temperature. Celsius is a temperature scale based on the freezing and boiling points of water. Standard atmospheric pressure equals one atmosphere at sea level conditions. Adding impurities like salt lowers the freezing point of water significantly.
Meteorologists track zero degrees Celsius as the critical threshold for winter frost formation. Winter road maintenance crews monitor this temperature when applying salt to melt ice. Standard laboratory experiments use ice water baths to calibrate temperature measuring instruments. One hundred degrees Celsius represents the standard boiling point of pure water. Four degrees Celsius is the temperature where liquid water reaches its maximum density. Minus forty degrees Celsius is a cold temperature where the Celsius and Fahrenheit scales align.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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