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In electrical and safety engineering, hazardous locations (HazLoc, pronounced haz·lōk) are places where fire or explosion hazards may exist. Sources of such hazards include gases, vapors, dust, fibers, and flyings, which are combustible or flammable. Electrical equipment installed in such locations can provide an ignition source, due to ...
A temperature coefficient describes the relative change of a physical property that is associated with a given change in temperature. For a property R that changes when the temperature changes by dT, the temperature coefficient α is defined by the following equation: Here α has the dimension of an inverse temperature and can be expressed e.g ...
The wet-bulb temperature ( WBT) is the temperature read by a thermometer covered in cloth which has been soaked in water at ambient temperature (a wet-bulb thermometer) and over which air is passed. [ 1] At 100% relative humidity, the wet-bulb temperature is equal to the air temperature ( dry-bulb temperature ); at lower humidity the wet-bulb ...
For this reason it is usual to specify the temperature that was measured at with a suffix, such as , and the relationship only holds in a range of temperatures around the reference. [9] The temperature coefficient is typically +3 × 10 −3 K−1 to +6 × 10 −3 K−1 for metals near room temperature. It is usually negative for semiconductors ...
A major revision to the storm signal system took place in 1917 when the new local and non-local storm signal codes were introduced on 1 July. The new local code was the first numbered tropical cyclone signal system in Hong Kong, consisting of seven signals (1 to 7)providing a standby signal, gale signals in four directions (N'ly, S'ly, E'ly and W'ly), an increasing gale signal and a hurricane ...
The thyroid hormones cross the follicular cell membrane towards the blood vessels by an unknown mechanism. [31] Text books have stated that diffusion is the main means of transport, [35] but recent studies indicate that monocarboxylate transporter (MCT) 8 and 10 play major roles in the efflux of the thyroid hormones from the thyroid cells. [32 ...
IP code. The IP code or ingress protection code indicates how well a device is protected against water and dust. It is defined by the International Electrotechnical Commission (IEC) under the international standard IEC 60529 [ 1] which classifies and provides a guideline to the degree of protection provided by mechanical casings and electrical ...
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