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Is polypropylene safe?

Polypropylene is used in the food packaging and bottling industries. It does not absorb moisture and remains unaffected by micro-organisms, such as bacteria and viruses. It is chemically inert and thus non-toxic. It is not a good conductor of electricity, and this makes it very safe, too.\nPolypropylene does not contain Bisphenol A which is used in the preparation of various plastics. This compound is found to be toxic, and its absence in polypropylene makes it safe.

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How much does 1 gallon of crude oil weigh?

The average domestic crude oil also has a gravity of 32 degrees. According to the United States Energy Information Administration, oil refineries in the United States produce about 19 gallons of gasoline for car motors from one barrel of crude oil. The rest of the barrel becomes other products, such as distillate and residual fuel oils, jet fuel and petroleum coke. Crude oil can also be used to create lubricants, asphalt, charcoal briquettes, wax crayons, birthday candles, polyester shirts and toothbrushes.

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Why do monsoons happen?

Throughout the year, approximately one quarter of the globe experiences monsoons. Monsoons exist in two primary forms: summer and winter monsoons. During the summer, most land areas generate more heat than ocean waters. The warm air over land draws air inward from the ocean, inviting the connection and solidification of molecules. Warm, rising air over land areas eventually creates large clouds. These clouds collect water moisture and water vapor. Eventually, they grow to large sizes, capable of producing steady rainfall. These heavy, moisture-laden clouds remain over certain areas of land, re..

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What was the Michelson-Morley experiment?

Early wave theories of light argued by analogy that light waves must have a medium through which to spread in the same way that sound waves do. The aether model was a theoretical effort to describe that medium. In a series of experiments, Albert Michelson (later joined by Edward Morley) attempted to measure the motion of the aether relative to the Earth. Their results were negative, demonstrating that light travels without an enabling medium and laying the groundwork for the later theory of Special Relativity.\nThe experiment involved splitting a beam of light inside a device called an interfe..

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What are some standard sizes for large picture frames?

Frames of 11x14 and 11x17 inches are generally used for miniature posters and for mounted art work in homes. Anything greater than these dimensions requires a larger frame. For art work larger than the standard sizes, it is recommended to present the image without a frame. Posters have different standard sizes. General room poster and decorative poster frames have a standard size of 24x36 inches, as is common with typical dorm room accessories.

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What physical changes occur during early adulthood?

Around the age of 30, changes related to aging start to occur in the body, according to Boundless. Vision is one of the significant changes, as during this time the lens of the eye begins to thicken and harden, resulting in a decreased ability to view objects close-up. Sound sensitivity also commonly decreases around this period, occurring twice as fast in men as in women. During this age range, the skin begins to dry out and wrinkles start to form. Reproductive function also begins to decline towards the end of early adulthood.\nAging is comprised of primary and secondary aging, according to ..

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How do you convert joules to kilojoules?

A joule is a unit of energy and is used internationally. According to Universe Today, lifting one apple over a distance of 1 meter requires the expenditure of approximately 1 J of work. Lifting 1,000 apples over the same distance, therefore, calls for the expenditure of 1,000 J, or 1 kilojoule of energy.

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How hot does magnesium burn?

Magnesium emits ultraviolet light when burning, so one must not look directly at the flame. Magnesium is used in flares and tracer ammunition.\nFighting a magnesium fire is quite unusual. It actually burns better in carbon dioxide, so fire extinguishers can accelerate the fire, instead of extinguishing it. Adding water occasionally causes a steam explosion, which spreads the fire. Water can even split into hydrogen and oxygen in a magnesium fire, resulting in a hydrogen explosion.

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What is epigenetics?

Epigenetic changes do affect the physical structure of DNA without affecting the sequence of the base pairs in the compound. These types of changes may add or remove chemical elements to affect how certain genes are expressed. Epigenetic alterations could also modify histone compounds. Histones are proteins that encompass DNA molecules. DNA strands wrap themselves around histones in order to shrink in size. Epigentic alterations can cause histones to relax and DNA to become more accessible for enzymes and proteins to read and express certain genes.

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What is the reaction between hydrochloric acid and magnesium?

This chemical equation represents a reaction between the active metal magnesium and a strong acid. These types of reactions will always produce a salt and hydrogen gas. In this reaction, the salt is magnesium chloride. Similarly, this is also a single replacement reaction in which the metal takes the place of another element in a compound. In this case, magnesium replaces the hydrogen in the acid, resulting in hydrogen gas being one of the products. The other product or magnesium chloride is a compound that has an atomic weight of 95.211 grams per mole.

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