Important context
The freezing-point reference
Pure water’s freezing/melting point is commonly referenced as 0 °C, but actual behavior can shift with pressure, dissolved substances and supercooling.
0 °G
0°G
The freezing-point reference.
0°G
= 0 °C = 32 °F
Water freezing is the familiar zero shared with Celsius. In everyday use, temperatures below 0 °G are below 0 °C.
Three landmarks
0 · 74 · 200
Together, the three registered landmark domains tell the scale's story: freezing, the human body reference, and boiling.