Science
Refine Search
What is a metal oxide varistor?
- By Forinfos
- 30/12/2025
- 0 comments
Metal oxide varistors are typically placed between two metal plates that serve as electrodes. When it is produced, a metal oxide varistor is rated for a certain number of uses. If a device is shorted above the varistor's rating, the metal oxide can begin to deteriorate, making a replacement necessary.
What is the force of attraction between objects?
- By Forinfos
- 30/12/2025
- 0 comments
Newton's law asserts that the strength of gravitational force between any two objects depends on their sizes. In other words, the larger the object, the stronger the gravitational attraction. Therefore, large bodies such as planets and moons are attracted together by a tremendous amount of gravitational force. The amount of force is measured in newtons, which is calculated by multiplying a universal constant, known as G, by the product of the two object's masses, and then dividing by the square of the distance between the objects.
How does overpopulation affect the environment?
- By Forinfos
- 30/12/2025
- 0 comments
Freshwater availability is a problem in most developing nations, and the per capita availability of freshwater has decreased by one-third over the past 50 years. Although the supply of freshwater is not infinite, the human population is increasing by 1 billion people every 12 years.\nFood production and distribution is also problematic when more arable land is needed for growing food. The amount of arable land on Earth is limited, leading farmers to begin cultivating dry hillsides. Erosion and loss of nutrients, which both contribute to soil degradation, are the result. As farmers begin to use..
Why do earthquakes happen?
- By Forinfos
- 30/12/2025
- 0 comments
The Earth's crust is made of several large plates that continuously grind against each other. At the borders between the plates, large sections of rock slide against, over or under each other. The process is not perfectly smooth, and static friction between two plates can temporarily arrest the movement. When this happens, tension builds up in the area as the plates continue to press against each other. Eventually, the border between the plates gives way and movement occurs. This shift in position can be lateral, as in a strike-slip fault, or it can be vertical, as in a subduction zone.\n..
Where does chlorine come from?
- By Forinfos
- 30/12/2025
- 0 comments
The discovery of chlorine gas was an accident that occurred in 1774, when a Swedish pharmacist dropped hydrochloric acid on manganese dioxide, producing a greenish yellow gas. Sir Humphrey Davy recognized chlorine as an element in 1810. The chlorine compound NaOCl was used in the fabric industry by the late 18th century as bleach.\nDuring the 19th century, chlorine was added to public water systems as a disinfectant, improving the lives and health of many people. Chlorine compounds help to kill bacteria, and hospitals first used bleach to disinfect areas in the 1850s, improving the quality of ..
What is the element iron used for?
- By Forinfos
- 30/12/2025
- 0 comments
Iron is one of the most abundant metals, comprising almost 5.6 percent of the Earth's crust and almost all of the Earth's core. Some of the mineral sources of iron are hermatite, magnetite, taconite, limonite and siderite.\nThe Royal Society of Chemistry notes that iron is the cheapest and most useful of all metals. It is generally used in making steel, which is used in civil engineering and the manufacturing industry. Ordinary carbon steel contains 0.1 percent carbon for mild steel and up to 2 percent carbon for high carbon steels, along with small amounts of other elements. Wrought..
What are the differences between spring and autumn?
- By Forinfos
- 30/12/2025
- 0 comments
Spring happens between the seasons of winter and summer. The first day of spring is always marked on the calendar as March 20th in the Northern Hemisphere and September 22 in the Southern Hemisphere. The temperature lies in between the winter cold and gradually heats up towards the beginning of summer. In the spring trees, flowers and plants can be seen in full bloom. This is also the time of year that many baby animals appear, and spring is known as the season of new beginnings.\nAutumn happens between the seasons of summer and winter. The first day of autumn is September 22 in the Northern H..
Why are rain clouds black?
- By Forinfos
- 30/12/2025
- 0 comments
Fewer heavy particles between sunlight and the ground means less light scattering. When water particles get heavier, such as before a rainfall, the darkening effect intensifies. Light scattering also causes the sky to turn blue. Thick layers of small molecules in the atmosphere turn light blue to the human eye.\nIt is possible to view the effects of direct sunlight on layers of clouds. When airplanes fly through the sky, passengers can see the top and bottom of clouds. Thick clouds do not let enough sunlight to the bottom of clouds, but passengers see sunlight filtering through the thinner top..
What is the difference between bronze, brass and copper?
- By Forinfos
- 30/12/2025
- 0 comments
Copper is one of the oldest metals known to civilization, and it is the only elemental metal other than gold to have a "gold-like" color. It is used by mankind for thousands of different purposes. Today, much of the copper in use is contained in alloys such as brass and bronze.\nBronze has a brownish metallic color, and it is made by combining copper with up to 11-percent tin. Bronze alloys are always water resistant, and they are used to make statues, medals and coins.\nBrass is defined as any metal alloy that consists primarily of copper in combination with zinc. There are many different kin..
How do hippos protect themselves?
- By Forinfos
- 30/12/2025
- 0 comments
Hippos have few significant predators. They spend most of each day submerged in rivers, where their primary predators are crocodiles. Adult hippos frequently kill crocodiles that attempt to bite them, but juveniles often succumb to injuries sustained during crocodile ambush attacks. Hippos live in herds containing one adult male, 10 to 20 adult females and their offspring. This grouping behavior is an effective defense mechanism that deters many would-be predators.\nWhile foraging on land, the primary predators that hippos face are lions and hyenas. Poaching is an equally serious threat. Hippo..