At pressures lower than atmospheric pressure, water will boil and thus change into steam at temperatures lower than 212 Fahrenheit (F).
(water; will boil; L:At pressures lower than atmospheric pressure) (water; change; into steam; L:at temperatures lower than 212 Fahrenheit)
water water
will boil change
L:At pressures lower than atmospheric pressure
into steam L:at temperatures lower than 212 Fahrenheit