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.
This value is important to physicists, chemists, engineers, and pilots and navigators. Standard temperature is defined as zero degrees Celsius (0 0C), which translates to 32 degrees Fahrenheit (32 0F) or 273.15 degrees kelvin (273.15 0K). This is essentially the freezing point of pure water at sea level, in air at standard pressure. Standard pressure supports 760 millimeters in a mercurial barometer (760 mmHg). This is about 29.9 inches of mercury, and represents approximately 14.7 pounds per inch (14.7 lb/in2). Imagine a column of air measuring one inch square, extending straight up into space beyond the atmosphere.