See also: Dealing with Breathing Problems written for patients. The term hyperventilation describes excessive ventilation of the lungs, beyond what is required to achieve normal arterial blood gases.
A light frost occurs when the temperature drops to below 32 degrees Fahrenheit, and refers to the conditions that allow a layer of ice crystals to form when water vapor condenses and freezes without first becoming dew. Harvest basil and other tender herbs before a light frost (when the temperature drops to 32 degrees Fahrenheit). 2  Even if they survive the frost, they don't do well in cold temperatures. 3  The same is true for most annuals.
There are two main ways that frost can form, with radiation being the most common method of formation in Australia. 1  Radiation frost: Radiation is the most common mechanism for frost formation in Australia. 2  Advection frost: Advection frost (also know as freeze) can occur at any time, day or night.