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Can sound travel through outer space?

It was formerly believed that space contained absolutely no medium, but recent studies have shown that outer space does in fact contain a small amount of molecules. However, these molecules are spaced too far apart in order to affect a sound wave and result in a detectable sound. NASA has developed ways to measure plasma waves, which can only be picked up by specialized equipment, with the deployment of Voyager I. While this shows that certain waves can travel through space, this does not mean that human ears are advanced enough to hear these "sounds," which are not technically sounds as they ..

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What is the density triangle?

The density triangle is laid out in three sections with mass in the top area. The area beneath mass is divided between density and volume. If density and volume are known, covering the mass section leaves the two bottom sections, one next to the other, indicating that density must be multiplied with volume to yield mass. This operation works in reverse, with volume multiplied by density.\nTo determine either density or volume, the undefined variable must be covered. This leaves mass and the other defined factor, either density or volume. In either case, mass is on top, which indicates that the..

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When does your head stop growing?

Subtle modification of facial structure occurs as the cheekbones move backward, the forehead moves forward, and the muscles and skin covering these bones move as well, Duke Magazine explains. The soft tissues of the face lose their support as the facial bones tilt forward. This results in drooping and sagging skin that has cosmetic implications in addition to causing medical concerns. For example, when the tissues surrounding the eyelids droop, vision problems can occur.

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What is a dissecting tray used for?

One of the first steps in a dissection is to rinse off surplus preservative. Also, dissection sometimes reveals dirt and waste inside the specimen that needs to be washed away. Using a spray mechanism rinses the debris away from the specimen, and the holes in the side of the dissecting tray allow all of the runoff to drain away without damaging the results of the dissection.

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What is the food chain in the tundra?

At the top of the food chain in the tundra are polar bears. Not only do they eat meat, but they eat other carnivores, such as seals. Other carnivores in this cold region include wolves, foxes, grizzly bears, owls and migratory birds during certain types of the year. These animals seek out rich, fatty meats to eat so that they can gain enough weight to survive cold, harsh tundra winters.\nHerbivores are below carnivores on the food chain. Caribou, arctic hares, lemmings and voles are all plant eaters that live in the tundra. Their strong sense of smell allows them to find vegetation to consume ..

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What is the function of chromosomes?

Chromosomes contain both DNA and protein, Genetics Home Reference states. These tightly packed, thread-like structures remain in the nucleus until the cell divides. When division occurs, according to lecture materials provided by the University of Illinois at Chicago, the chromosome has an x-like structure and is made up of two chromatids, which are two duplicated chromosome, connected by a centromere. This division, called mitosis, has five stages: interphase, prophase, metaphase, anaphase and telophase. During these stages, the chromosomes duplicate themselves, line up in the middle of the c..

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What are the effects of temperature on the respiration of yeast?

Respiration is a crucial part of the fermentation process that occurs when yeast breaks down carbohydrates into carbon dioxide and alcohols. When yeast cells are able to respire more efficiently, they can in turn break down carbohydrates more efficiently, leading to more fermentation taking place. By knowing the precise temperature at which a specific yeast ferments most efficiently, less yeast is wasted and better products are created.\nSome of the oldest known human-produced nourishment, including most types of bread and all alcoholic beverages, depend on the yeast fermentation process, so h..

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Are rubber plants poisonous?

A person who is having a reaction to latex may display a multitude of symptoms, including rash, severe itching, hives, dizziness, difficulty breathing, abdominal pain and anaphylactic shock. A cross reaction can also occur with exposure to foods that contain similar proteins. People with multiple allergies may be at a higher risk for developing a sensitivity to latex, as well as those who are in constant contact with latex, such as those who work in medical fields or food service.

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What is the melting point of mercury?

Mercury is very volatile, and despite its high boiling point relative to water, it readily releases vapor into the air. This vapor is very dangerous, as it is toxic to humans. It can be absorbed through the respiratory tract, the digestive tract or the skin. It builds up in the body with exposure over time, and can eventually cause severe illness or death at high enough levels.

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Is used solar equipment a reliable option?

Little data exists regarding the longevity of a solar panel because so many original panels are still in use. Used solar panels typically put out up to 10 percent less power than new panels, as some degradation of equipment is caused by sunlight. Stored panels that have not been in the sun show little to no degradation.\nA used solar panel should be tested with a multimeter in full sunlight to ensure functionality. Used equipment, such as batteries, is less reliable than panels and should only be purchased from a reputable source.

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