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.
A light frost is generally when temps remain above 28 degrees and last only a few hours. A hard or killing frost is when it gets below 29 or sub-freezing temps are prolonged (more than 24 hours).Plants are much better able to survive a light frost.Once you get below 28 degrees and beyond 6 hours below freezing, plants are much more susceptible to damage. Like Bookmark March 26, 2012 at 11:02PM. hard or killing frost is when it gets below 29 or sub-freezing temps are prolonged (more than 24 hours). Plants are much better able to survive a light frost. Once you get below 28 degrees and beyond 6 hours below freezing, plants are much more susceptible to damage. Like Bookmark March 26, 2012 at 11:02PM.