Science

Refine Search

What did Eugen Goldstein discover?

There is some confusion as to whether Goldstein identified that hydrogen ions were protons because the mass to charge measurements that identified protons were not made until later by Wilhelm Wien.\n\nThe proton is one of three atomic particles that all atoms can contain, along with electrons and neutrons. A single proton contains a positive charge of 1. Protons are important in fields of science, in particular chemistry and physics, that try to understand how particles interact.

Continue Reading

What is the science behind the Mentos and soda experiment?

The bubbles in soda are the result of carbon dioxide gas added during soda production. Because water molecules hold tightly to one another, they tend to form a protective layer around the carbon dioxide bubbles, making it difficult for bubbles to grow or for new bubbles to form. Dropping Mentos into soda causes the candy to begin to dissolve, breaking up some of the water's surface tension. With the surface tension broken, carbon dioxide bubbles grow and multiply on the candy's surface.\nThe reaction is further aided by the imperfections on the surface of Mentos. The tiny pits and bl..

Continue Reading

How do plants protect themselves?

Like humans, plants have immune systems that protect them against attack from pathogens. Just as hormones and chemicals defend people against viruses, bacteria and other diseases, the immune systems of plants contain chemicals and nutrients that fight off attacks from diseases and parasites. Many plants produce the chemicals that they need to build their defense systems during the earliest stages of life, while others begin producing those agents following encounters with foreign pathogens.\nIn addition to their active immune systems, plants secrete special chemicals, which are often scentless..

Continue Reading

What are rock and gem shows?

State and local mineralogical organizations sponsor these gatherings, some of which last three days in a row over a weekend. The Tucson Gem and Mineral Show, held over four days in February, touts itself as the largest such show in the United States. The 61st annual event, held in 2015, will feature the theme "Minerals of Western Europe." The Tuscon Gem and Mineral Society sponsors the rock and gem show, an event open to the public with retail dealers only.

Continue Reading

How much is topaz worth?

Topaz is found in over 21 colors, including varying hues of yellow, orange, blue and pink. The clarity of topaz heavily influences its value; over 10 clarity values exist to determine its worth. As of September 2014, the gem is most valuable in 30 carats of light reddish purple, worth approximately $1,393.06. The least valuable incarnation of topaz is 1 carat of colorless topaz, worth $7.77.

Continue Reading

What does it mean if you have a high protein count in your urine?

Proteinuria is the medical name for excessive amounts of protein present in urine. Proteinuria is a symptom caused by temporary conditions, such as a fever or extreme exercise, or it can be caused by more chronic conditions such as chronic kidney disease, leukemia and rheumatoid arthritis, reports WebMD. People who have other conditions such as diabetes and high blood pressure, which can damage kidneys and result in elevated levels of protein, should see a doctor.\nProtein content is a common part of a urinalysis, and it is common to have it in small amounts. Mild elevations in protein general..

Continue Reading

How many flags are on the moon?

The Apollo program lasted between 1961 and 1975 and resulted in six successful manned missions to the Moon. Flags were planted by the Apollo astronauts at the site of each landing and, decades later, all but the Apollo 11 flag are still standing, as of 2014. The flags are thought to have been bleached of all color from constant unprotected exposure to the Sun's ultraviolet rays.

Continue Reading

What is an electromagnetic crane?

Electromagnetism is formed by the application of electric current to a special type of magnet that only produces a magnetic field when power is applied. Electromagnets are common in everyday items and objects, with a speaker being just one example.Any electromagnet is essentially composed of a conductive metal surrounded by wire, and the electromagnetic crane is no exception. An iron core is surrounded by wire that serves as the medium for the electricity.The power of an electromagnet is determined by a number of factors, including the size of the iron core, the amount of times the wire is loo..

Continue Reading

What are some guidelines for a blood transfusion?

Blood transfusions are recommended for stable, hospitalized patients whose hemoglobin count is below 7 to 8 grams per deciliter, informs the American Society of Hematology. Care providers should also consider a transfusion for individuals with cardiovascular disease complaining of chest pain or orthostatic hypertension. Transfusion treatment is not typically recommended in individuals with chronic anemia or those with hemoglobin counts above 8 grams per deciliter.\nBlood transfusions are given to prevent or correct hypovolemic shock in individuals who are actively bleeding, explains PubMed Cen..

Continue Reading

What is the meridian in astronomy?

The celestial meridian changes by the position of the observer. The zenith is the point directly above the observer, expounds University of Tennessee’s Department of Physics and Astronomy. The north and south are on the horizon of the observer. The celestial meridian runs as a line through all three of these points. It helps guide observers to constellations and planets. The celestial sphere contains all of the night sky that an observer sees at once, and the observer only sees half of the sky.

Continue Reading
Showing 311 to 320 of 10000 (1000 Pages)