# Given the following, how many degrees must the temperature drop for the antifreeze to turn to ice?

## Ocean water freezes at about -2 °C. Fresh water freezes at 0 °C. Antifreeze, a liquid used to cool most car engines, freezes at-64°C. Imagine that the temperature is exactly at the freezing point for ocean water.

Feb 13, 2017

The temperature must drop by 62 °C.

#### Explanation:

The temperature drop, ΔT is the difference between the final and initial temperatures

color(blue)(bar(ul(|color(white)(a/a) ΔT = T_"f" - T_"i"color(white)(a/a)|)))" "

${T}_{\text{f" = "-64 °C}}$
${T}_{\text{i" = color(white)(ll)"-2 °C}}$

ΔT = "-64 °C - (-2 °C)" = "-64 °C + 2 °C" = "-62 °C"