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How do steam engines work?

The birth of the steam engine played a large role in the industrial age that occurred in the 1800s. The railroad had existed before steam engine trains began to be used, but they involved the carts being pulled by horses or other manual means down the tracks. With the invention of the steam engine, the trains were able to move greater loads and even transport people. They could also travel greater distances much faster. This meant that supplies could get to towns faster and people could venture farther into unsettled territories and still be able to get the supplies they needed to survive. The..

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What are the pros and cons of hydropower?

Hydropower requires a dam to be constructed in a valley. Eventually, a reservoir lake fills behind the dam. Channels guide the reservoir water into the dam to turbines that spin rotors on generators. The generators produce electricity that is delivered directly to the power grid. As more electricity is required, additional generators can be brought online if they are available.\nDams prevent or reduce the ability of fish and other wildlife to traverse the river. While some steps can be taken to ease the problem, such as fish ladders to help fish swim upstream, it is widely recognized that dams..

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What are the major functions of the respiratory system?

Air inhaled through the nose and mouth passes through the larynx, or voice box, and down a tubular windpipe in the neck and chest, known as the trachea, states the National Heart, Lung, and Blood Institute. The trachea branches off to the left and right bronchi, both of which branch off to several smaller airways, or bronchioles. The lungs expand as they fill up with air, allowing an individual to breathe in and out. The bronchioles inside each lung feed into tiny air sacs, or alveoli, which are lined with blood vessels designed to absorb oxygen into the bloodstream. The pulmonary artery carri..

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What is the molar mass of N2O?

Nitrous oxide is a non-flammable, sweet smelling gas when it is at room temperature. At elevated temperatures, nitrous oxide becomes a powerful oxidizer. The gas is often used in dental and surgical procedures as an anesthetic and a pain reliever. When inhaled in large concentrations, nitrous oxide causes patients to feel a sense of euphoria. The chemical compound is also used in the motor racing and rocket industries to increase the power output of engines.

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What is diffusion?

Diffusion occurs in liquids as well. When a drop of food coloring is placed in a cup of water, it starts to move throughout the water. It keeps going until it is spread evenly in the entire cup. Diffusion happens in gases, like air and liquids, like water, because the particles move so freely.\nGases diffuse quickly because their molecules are so spread out. Liquid molecules are closer together, so diffusion is a bit slower.\nSolids do not diffuse because their molecules move very little. They only vibrate in place. However, a gas may diffuse through a solid. For instance, a balloon gradually ..

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Is all matter made up of molecules?

In science, matter is defined as anything that occupies space and has rest mass. The most predominant forms of matter on Earth are categorized into three: solid, liquid and gas. A fourth classification, called plasma, has the biggest proportion of matter in the universe.A chemical element is a pure substance that cannot be further divided into another type of material by any chemical means or transformation. In the early 17th century, the English chemist John Dalton proposed that chemical elements are made up of distinct atoms that retain all the properties of the element. Atoms fundamentally ..

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What supplies are used for lab safety?

Most professional laboratories, and even some outdoor workspaces, require some level of personal protective equipment. Safety glasses and shields protect the wearer's eyes from splashes directly to the face, and goggles form a protective seal around the eyes. Lab coats protect skin and clothes from toxic or biohazardous substances. Removing a loose-fitting lab coat is easy in the event of a spill, preventing the substance from contacting skin. Simple nitrile or rubber gloves protect the hands from contact with dangerous materials, but thicker gloves are essential for certain chemicals.\n\..

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What animal has six legs?

Six-legged insects are classified as arthropods, but there are other arthropod species that have more than six legs, including arachnids, or spiders, and centipedes. Crustaceans, diplopods and hexapods are also within the arthropod classification. The general characteristics of an arthropod are an exoskeleton, a dorsal blood pump, a segmented body, a ventral nerve cord, jointed limbs and bilateral symmetry. The six legs support and enable what is referred to as the tripod gait.

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What is the alpha scattering experiment?

The alpha particles are produced by radioactive nuclides and are made to hit a gold foil a few atoms deep at a fixed angle in a vacuum. A zinc-sulfide-coated microscope lens attached to a turntable detects the deflected alpha particles at various angles. The lens at zero angle detects a higher number of scintillations per minute, while it detects lower rates at larger angles.\nThe results of Rutherford's experiments were mathematically evaluated, and the conclusion is that the particles that went straight through indicate the presence of an empty space in an atom. Particles that were less..

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How does solar energy work?

According to the Union of Concerned Scientists, each square meter of the earth's surface generates approximately a barrel of oil each year. Areas with little cloud cover, such as deserts, receive the most sun and generate the largest amount of solar energy. Solar energy is harnessed using solar heat collectors, solar thermal concentrating systems and photovoltaic cells. Solar heat collectors sit on rooftops, and they are used to collect solar energy for space heating, water heating and space cooling.\nSolar thermal concentrating systems use mirrors and lenses to concentrate the rays of th..

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