The term used to describe the internal stresses created when glass is subjected to variations in temperature across its area. If the temperature differentials in the glass are excessive, the glass may crack. This is referred to as thermal breakage or fracture.
occurs during clear winter and spring days when the roof can experience extreme temperature variations in a short time period. It typically occurs during winter and spring nights when temperature variations may exceed 50º in a twenty-four hour period and fiberglass shingles cannot typically withstand this variation due to the shrinking and expansion activity associated with thermal stress
This is a condition, which is usually associated with koi, although it can affect any fish that are subjected to continual temperature changes. Affected fishes become listless and appear sick and emaciated. Recovery is dependent upon a consistent warmer water temperature and can be hastened by feeding with a food containing antibiotics which reduce the chances of bacterial infection.