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.
Frost or freezing occurs when the temperature of air falls below the freezing point of water (0 Â°C, 32 Â°F, 273.15 K).This is usually measured at the height of 1.2 m above the ground surface. There is a rather subjective scale to show several degrees of frost severity: 1  slight frost: 0 to â3.5 Â°C (32.0 to 25.7 Â°F).or example, frost is used sometimes to indicate ice which forms on the ground during cold nights, but other times to indicate air temperature below freezing point. Hoar frost should be used for any frosted surface but it is sometimes reserved to indicate big ice crystals forming on very cold surfaces.