effusion time

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• Effusion — In chemistry, effusion is the process where individual molecules flow through a hole without collisions between molecules. This occurs if the diameter of the hole is considerably smaller than the mean free path of the molecules [K.J. Laidler and… …   Wikipedia

• Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …   Universalium

• respiratory disease — ▪ human disease Introduction  any of the diseases and disorders that affect human respiration (respiration, human).  Diseases of the respiratory system may affect any of the structures and organs that have to do with breathing, including the… …   Universalium

• gas — gasless, adj. /gas/, n., pl. gases, v., gassed, gassing. n. 1. Physics. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid. 2. any such fluid or mixture of fluids. 3. any… …   Universalium

• Otitis media — Classification and external resources A view of the tympanic membrane showing acute otitis media ICD 10 H …   Wikipedia

• Chest X-ray — A chest X ray, commonly abbreviated CXR, is a projection radiograph (X ray), taken by a radiographer, of the thorax which is used to diagnose problems with that area. The typical radiation dose to an adult from a chest x ray is around 0.06 mSv (6 …   Wikipedia

• Osteochondritis dissecans — For other uses, see OCD (disambiguation). Osteochondritis dissecans Classification and external resources A large flap lesion in the femur head typical of late stage Osteochondritis dissecans. In this case …   Wikipedia

• Mesothelioma — Classification and external resources Left sided mesothelioma with mediastinal node enlargement : CT scan. ICD 10 C …   Wikipedia

• Breast cancer — Classification and external resources Mammograms showing a normal breast (left) and a cancerous breast (right). ICD 10 C …   Wikipedia

• Aortic dissection — Classification and external resources Dissection of the aorta descendens (3), which starts from the left subclavian artery, reaching to the abdominal aorta (4). Aorta ascendens (1) and aortic arch (2) are not involved …   Wikipedia

• Graham's law — Graham s law, also known as Graham s law of effusion, was formulated by Scottish physical chemist, Thomas Graham. Graham found experimentally that the rate of effusion of a gas is inversely proportional to the square root of the mass of its… …   Wikipedia