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Why is aluminum foil a good insulator?

The side that the aluminum foil is placed on affects how it insulates. For example, placing aluminum foil on the outside of a box keeps the inside cooler by reflecting heat away from the box. However, placing aluminum foil on the inside of a box helps keep heat from escaping. According to the Cold Climate Housing Research Center, foil is often used for reflective insulation in attics, but is most effective in warm climates.\nInsulation is not used to keep cold air from entering an area. Instead, it is used to slow down or prevent the flow of heat from one area to another. Heat is only able to ..

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What do body cells do?

Cells that do the same job combine together to form body tissue, such as muscle, skin or bone tissue. Groups of different types of cells make up the organs in your body, such as your heart, liver or lungs. Red blood cells contain the protein haemoglobin, which carries oxygen around your body, and white blood cells defend the body against infection and disease. Brain cells communicate by sending tiny electric signals to each other; the more signals that are sent, the more electricity the brain will produce. Regular exercise does not help you gain more muscle cells; instead it makes each cell gr..

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What is meant by the statement "motion is relative"?

A similar example is a cat sleeping on a rug. The cat appears to be at rest to an observer on Earth, but relative to an object at a fixed point in space, the cat is moving as fast as the Earth turns. As these examples show, discussions of motion must include a point of reference, especially when calculating measurements such as speed. For example, if a train is traveling 90 miles per hour and a man walks from the back of a train car to the front, how fast is the man moving? The answer depends on the point of reference. To another passenger in the train, the man is moving at a rate much less th..

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What does 1000 grams equal?

The unit "gram" is the base unit used to measure weight or mass in the metric system. The mass of one cubic centimeter of water at 4 degrees Fahrenheit is about the same as one gram. A paper clip's mass is about 1 gram.\nOther metric units of mass include the metric ton, which is the same as 1,000 kilograms or 1 million grams. A centigram equals 100 grams, while a milligram is one-thousandth of a gram.

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What are glow-in-the-dark plants?

The DNA sequence required for the bioluminescent gene is created with BioCAD software and then printed using DNA laser printing. Later on, the DNA is inserted using a gene gun. In 1986, the first bioluminescent plant was created at the University of California by artificially inserting the luciferin gene. As of 2014, a working prototype of the glow-in-the-dark plant exists and emits a natural glow and that can pass on the glowing gene. There was a campaign to stop the development of the glowing plant that raised $2,274. A campaign to develop the glow-in-the-dark plant raised $484,013.

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What will happen if the greenhouse effect continues to increase?

Almost all science organizations acknowledge the existence of the greenhouse effect and global warming. The greenhouse effect results from the interaction between incoming solar radiation from the sun and the Earth's atmosphere. Gases in the atmosphere absorb about 90 percent of the heat and radiate it back to the surfaces. When the intense human activity causes the high concentration of these gases to grow, the heat trapped in the atmosphere increases. This accumulated heat increases the average temperatures and thus changes weather and climate patterns.\nThe higher temperature of the pl..

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How many species of animals are there?

Less than 1 million of the estimated 7.77 million species were officially cataloged in 2011, and only 1.2 million species were cataloged across all five kingdoms. The Census of Marine Life predicts that 86 percent of all land species and 91 percent of all water species are yet to be discovered, as the majority of tiny life forms are still unknown.

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What happens when you fall asleep?

In stage one, the brain waves and muscle activity slows down. Stage two contains about half of the sleep period. There are calmer brain waves and no eye movement. Breathing slows, and the body’s temperature drops slightly. A person in stage two can easily be awoken. In stages three and four, it becomes harder to wake up someone. Breathing slows into a rhythm, blood pressure and body temperature drop, and the muscles relax. Stages three and four are known as slow-wave sleep because during these stages are the slowest of all brain waves.\nRapid eye movement begins after about 90 minutes of sle..

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Where does cell respiration take place?

Cellular respiration is the method by which cells generate energy. Hartnell College explains that the cells break down glucose molecules in order to produce adenosine triphosphate, or ATP. ATP is the body’s energy currency, and it is necessary to power all of an organism’s basic functions.\nThere are three different parts of cellular respiration. Some of the steps require oxygen, while others do not. The first part of the process, called glycolysis, takes place in the cytoplasm of the cells. Glycolysis does not require oxygen, and only produces two molecules of ATP.\nThe next two steps in ..

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How is oil separated into fractions?

Crude oil is a raw material obtained from the Earth's crust. It is made from many different chemicals, most of which are hydrocarbons. These are chain molecules made exclusively from hydrogen and carbon and vary in length.\nCrude oil becomes useful after it has been processed at an oil refinery. These refineries use the fractional distillation technique and what is called a fractioning tower. In this tower, the hottest molecules are found at the bottom, and the cooler molecules are found at the top. The smallest molecules move to the top due to their low boiling points while larger molecu..

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