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What are the physical properties of octane?

Octane has a density of 0.703 grams per centimeters -3. As it can come in one of 18 isomers, octane has different melting points. These can range from minus 70.9 to minus 69.8 Fahrenheit. The boiling point of octane can vary between 257.1 and 258.9 degrees Fahrenheit. The vapor pressure is 1.47 kilopascals at about room temperature, or 68 degrees Fahrenheit. The viscosity of octane is 542 micropascal-seconds, also at room temperature. It has a flashpoint of 55.4 degrees Fahrenheit and an autoignition temperature of 428 degrees Fahrenheit.\nOctane is a hydrocarbon, which makes it an organic mol..

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What is the law of Laplace?

Further, this law is significant in that it helps health professionals understand the conditions that change oxygen demand that lead to angina and discover therapies that could relieve angina. The law of Laplace implies that transluminal pressure is directly proportional to tension found in vessel walls but is inversely proportional to vessel radius. This means that the pressure exerts tension by pushing against the wall until it stretches. Thus, as the vessel's size decreases, tension in the wall also decreases.

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What is the pathway of blood circulation?

The systemic circuit and the pulmonary circuit originate in the heart. De-oxygenated blood first enters the heart through the inferior and the superior vena cavae. Next, the blood moves into the right atrium and then flows into the right ventricle. Then, the de-oxygenated blood enters the pulmonary artery and flows into the lungs to become oxygenated. The blood then leaves the lungs and enters the left atrium. It then flows from the left atrium to the left ventricle to the aorta. The aorta pushes the blood out of the heart and sends oxygenated blood through the systemic circulation.

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What are some tips for getting kids involved in recycling?

Putting recycling bins in high-traffic areas, such as your child's bedroom or the kitchen, makes it easier for them to get involved in recycling. The more conveniently located it is, the more likely the kids are to take part.\nTurning recycling into a game is another great way to get kids involved. Set goals for the kids, and reward them if they are able to reach those goals. You can also have them design their own recycling bins so that they feel as though they have ownership. Another activity to do with kids is to reuse some of the recyclable items. Brighthub.com provides some examples ..

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Which element is the only one that does not have any neutrons?

Hydrogen is the simplest element on the periodic table and the most abundant element in the universe. One of the best-known properties of hydrogen is its ability to combine with oxygen to form water. This feature gives the element its name. Hydrogen is derived from the Greek "hydro" and "genes," which means "forming water." While hydrogen's existence was known for centuries, it was first recognized as an element in 1766 by Henry Cavendish.

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What does acid rain do to the environment?

In addition to the sulfuric and nitric acid from the precipitation itself, acid rain also releases aluminum into aquatic systems from its interaction with soils in a watershed. When acid rain flows through soils in a watershed, it releases aluminum. When it flows through nearby shorelines and soil, aluminum is absorbed into the soil. The influx of acid rain and aluminum makes waters toxic to most aquatic organisms, including fish, clams and crayfish.\nAcid rain also causes severe damage to trees and forests at higher elevations because it strips the soil of vital nutrients and releases alumin..

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What is the ratio of water to steam?

Generally, the expansion of water into steam depends greatly on temperature and atmospheric pressure. When water boils and turns from a liquid into a gas, the gaseous form fills a much larger area. Steam has been an important tool in years of human invention and has been used to power engines or cook food like vegetables or rice. It is most often used to remove wrinkles from clothing.

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What does "soluble" mean in science?

The solubility of a substance is highly dependent on the relationship between the solute and the solvent. The solute is the substance that dissolves, while the solvent is the substance into which the solute dissolves. The stronger the attraction between the solute and the solvent, the greater the solubility of the substance. When the attraction is weak, there is less solubility. When a solute dissolves into a solvent, the resulting substance is called a solution.

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How many unpaired electrons does a chromium atom have?

Chromium does not follow the normal way of electronic configuration whereby the lower energy levels are filled first before moving to higher energy levels. However, for transition elements, the inner shells do not need to be full before moving to a higher energy level. For instance, the third shell of the chromium atom can hold up to 18 electrons but it has only 12 electrons. Three of these unpaired electrons, however, are able to occupy different energy levels.

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How much is 400 kilograms in pounds?

Kilogram is a base unit in the International System of Units (SI), whereas the pound is commonly used in the U.S. measurement system. A simple ratio is used when converting kilograms to pounds. Multiplying the number of kilos by 2.20462262 gives the answer. On the other hand, when converting pounds to kilograms, the figure has to be divided by 2.20462262 to get the correct answer. Generally, 2.20462262 is rounded off to 2.2 for ease in calculations.

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