at what temperature does water freeze

Water normally freezes at 0 degrees Celsius, which is 32 degrees Fahrenheit, under standard atmospheric pressure (sea level) and when it is reasonably pure.

Quick scoop

• Standard answer:
  • 0 °C
  • 32 °F
  • 273.15 K (Kelvin)
    These are the commonly taught freezing points of water.

• But it’s a bit nuanced:
  • Impurities (like salt or minerals) lower the freezing point, which is why salty seawater freezes below 0 °C.

* Changes in pressure can also shift the exact temperature slightly, so in unusual pressure conditions water can freeze at temperatures a bit above or below 0 °C.

* In special lab or cloud conditions, liquid water can be “supercooled” and stay liquid well below 0 °C (down to around −40 °F in some observations) before it suddenly turns to ice.

A simple way to think about it

If someone asks you “at what temperature does water freeze?” in everyday life (kitchen, weather forecast, school science):

• Say: 0 °C or 32 °F – that’s the practical, standard answer.

• Add (if you want to sound a bit more expert): “That’s for pure water at normal air pressure; salt or different pressures can shift it slightly.”

TL;DR: For normal, pure water at everyday conditions, water freezes at 0 °C (32 °F), even though in special situations it can freeze a bit above or below that.

Information gathered from public forums or data available on the internet and portrayed here.