by Hivesguy. Dermatographism (also called dermatographic urticaria, or dermographism), is a skin disorder which is characterized by the skin producing a hypersensitive reaction when scratched, scraped, rubbed, or otherwise traumatized.ermographism pictures and images like the one below show how the skin forms a wheal on its surface after being stroked or rubbed with a rigid object. Notice how the letters and numbers are very distinct, which is where the term âskin writing diseaseâ getâs its name.
The ideal freezer temperature is 0 Fahrenheit (-18 Celsius) for storing food. And -10 Fahrenheit (-23 Celsius) is recommended when freezing food. For every five degrees Fahrenheit above zero, the recommended storage time is cut in half.
Fahrenheit is a thermodynamic temperature scale, where the freezing point of water is 32 degrees Fahrenheit (Â°F) and the boiling point 212Â°F (at standard atmospheric pressure).This puts the boiling and freezing points of water exactly 180 degrees apart.elsius. Although initially defined by the freezing point of water (and later the melting point of ice), the Celsius scale is now officially a derived scale, defined in relation to the Kelvin temperature scale.