氷点

1. Origins, structure, and basic meaning

• Structure: 氷点 is read as ひょうてん and is a noun for the freezing point, the temperature boundary at which water begins to freeze.
• Basic usage: Use 氷点に達する for reaching the boundary and 氷点を下回る for falling below it.

2. Common pitfalls and similar expressions

• Not merely a low temperature
  • 氷点 is not a general label for any very low temperature; it is the threshold at which water begins to freeze.
• Contrast with 零度
  • 零度 states the numerical temperature of zero degrees, while 氷点 foregrounds the physical boundary where water changes into ice.