Full Definition of AUTISM. : a variable developmental disorder that appears by age three and is characterized by impairment of the ability to form normal social relationships, by impairment of the ability to communicate with others, and by stereotyped behavior patterns.â auÂ·tisÂ·tic \oÌ-Ëtis-tik\ adjective or noun. a variable developmental disorder that appears by age three and is characterized by impairment of the ability to form normal social relationships, by impairment of the ability to communicate with others, and by stereotyped behavior patterns.
Other organizations have established a variety of alternative definitions for their standard reference conditions. In chemistry, IUPAC has established two standards: standard temperature and pressure (STP) as a temperature of 273.15 K (0 Â°C, 32 Â°F) and an absolute pressure of exactly 100 kPa (1 bar).
Main article: Conversion of units of temperature. 1 The temperature scale is in disuse, and of mere historical interest. 2 Normal human body temperature is 36.8 Â±0.7 Â°C, or 98.2 Â±1.3 Â°F. The commonly given value 98.6 Â°F is simply the exact conversion of the nineteenth-century German standard of 37 Â°C.