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Burns that affect only the superficial skin layers are known as superficial or first-degree burns. [ 2 ] [ 11 ] They appear red without blisters, and pain typically lasts around three days. [ 2 ] [ 11 ] When the injury extends into some of the underlying skin layer, it is a partial-thickness or second-degree burn . [ 2 ]
The original can be viewed here: Burn Degree Diagram.svg: . I, the copyright holder of this work, hereby publish it under the following licenses: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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For example, a person weighing 75 kg with burns to 20% of his or her body surface area would require 4 x 75 x 20 = 6,000 mL of fluid replacement within 24 hours. The first half of this amount is delivered within eight hours from the burn incident, and the remaining fluid is delivered in the next 16 hours.
The degree of flammability in air depends largely upon the volatility of the material – this is related to its composition-specific vapour pressure, which is temperature dependent. The quantity of vapour produced can be enhanced by increasing the surface area of the material forming a mist or dust. Take wood as an example.
The main feature of thermodynamic diagrams is the equivalence between the area in the diagram and energy. When air changes pressure and temperature during a process and prescribes a closed curve within the diagram the area enclosed by this curve is proportional to the energy which has been gained or released by the air.
Diagram showing the five requirements for a dust explosion. There are five necessary conditions for a dust explosion: [3] A combustible dust; The dust is dispersed in the air within certain flammability limits; There is an oxidant (typically atmospheric oxygen) There is an ignition source; The area is confined – a building can be an enclosure
One solution to this problem is to perform the following steps: [3] Light one end of the first fuse, and both ends of the second fuse. Once the second fuse has burned out, 30 seconds have elapsed, and there are 30 seconds of burn time left on the first fuse. Light the other end of the first fuse. Once the first fuse burns out, 45 seconds have ...