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What does maintenance code 110A or 640F mean for a 2005 Volvo S40 2.4i?
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What is the flash point of low density polyethylene?
The flash point of HDPE (High-Density Polyethylene) plastic is not a relevant property for this material. The flash point refers to the lowest temperature at which a substance emits vapors that can ignite when exposed to an open flame or a source of ignition. HDPE is a thermoplastic polymer, and it does not have a distinct flash point like flammable liquids or gases. Thermoplastics like HDPE do not emit flammable vapors at temperatures below their melting points. Instead, they soften and melt gradually when heated above their specific melting points. The melting point of HDPE can vary depending on its molecular weight and density, but it typically falls within the range of 120 to 130°C (248 to 266°F). If HDPE is exposed to temperatures significantly above its melting point, it will start to melt and become molten rather than emitting flammable vapors. As with any material, it's essential to handle HDPE with care and avoid exposure to high temperatures that could lead to melting and potential hazards.
What is the melting point and boiling point of ammonia gas?
Good question. At sea level pressure (14.7psia), ammonia boils at -28degrees F or approximately -33degreesC. Under considerably greater pressure, it is a liquid even at room temperature. Because it can be readily compressed into a liquid at room temperature and well beyond, it becameTHE refrigerant of choice in the early days of mechanical refrigeration and air-conditioning. However, its toxic nature made it dangerous/unsuitable to use in home refrigeration, and absolutely unsuitable for use in car air conditioning. When DuPont invented dichlorodifluoromethane, or "Freon12" in the 1940s, with a P-T liquification curve similar to that of ammonia, ammonia was quickly displaced in many/most applications in favor of "Freon12" and car air conditioning came into being. However, even to this day ammonia is still used as a refrigerant in some industrial applications, such as ice houses, due to its cheap price, and it poses no threat to the overall environment.
