While both irritable bowel syndrome and inflammatory bowel disease can have similar symptoms including abdominal pain, diarrhea, and urgent bowel movements; however, IBS is not the same as IBD. IBD is a group of separate diseases that includes ulcerative colitis and Crohn's disease, and is a more severe condition.
psychrometer - a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air. dry-bulb thermometer - an ordinary thermometer with a dry bulb; used to measure the air temperature. hygrometer - measuring instrument for measuring the relative humidity of the atmosphere. wet-bulb thermometer - a thermometer with a bulb that is covered with moist muslin; used in a psychrometer to measure humidity.
I assume we're talking incandescent bulbs here. The classic bulb is a tungsten filament in a glass vacuum envelope. The wear out mechanism for these is that the Tungsten vaporizes a little bit at a time and deposits on the glass. Contaminents such as molecules of air (oxygen) in the vacuum envelope probably accelerate this a little.