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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
What are the three types of volcanoes and how are they formed?
An active volcanoe is erupting or has erupted recently. A dormant volcano has not erupted recently, but may erupt again in the future. It could be considered as "sleeping". An extinct volcano will never erupt again.
The limit that trees do not grow beyond a mountain?
Trees may not grow beyond a certain altitude on a mountain due to harsh environmental conditions such as low temperatures, high winds, and limited soil nutrients. As the altitude increases, trees struggle to survive because of decreased oxygen levels and shorter growing seasons. These factors create a tree line, marking the upper limit of tree growth on a mountain.
Is tearing paper a physical Is tearing paper a reversible or irreversible change?
Tearing paper is a physical change that is reversible. It can be reversed by taping or glueing the torn pieces back together. The paper retains its chemical composition after tearing, making it possible to revert back to its original state.
Will carbon dioxide gas blow up balloons?
Yes, carbon dioxide gas can be used to blow up balloons. When carbon dioxide gas is released into a balloon, it fills the space inside the balloon, causing it to inflate. Carbon dioxide can be produced by mixing baking soda with vinegar or by using a carbon dioxide tank.
How does sound travel from a source into your ear?
Sound travels from a source as a series of compressions and rarefactions in the air (sound waves). These waves enter the ear canal and cause the eardrum to vibrate. The vibrations are then transmitted through the middle ear bones to the cochlea in the inner ear, where they are converted into electrical signals that are sent to the brain via the auditory nerve.
Is blood or platelet transfusion the treatment of acute dengue infection in severe degree requires?
Platelet transfusion is generally recommended for severe cases of dengue infection if the platelet count drops significantly and there is bleeding. Blood transfusion may be necessary if there is severe bleeding or if there is a significant drop in hemoglobin levels. Transfusions should only be done under the guidance of a healthcare professional.
Yes, 20-year-old M80 firecrackers may become unstable and potentially dangerous due to chemical degradation over time, especially if stored in fluctuating temperatures. It is advisable to handle them with caution and dispose of them properly to avoid any safety hazards.
What does the biggest bug look like?
A large swimming cockroach with segmented sturdy legs and stag beetle-like pincer antennae is what the biggest bug looks like. A bug taxonomically is a member of the Belostomatidae insect family, of which South American water bugs (Lethocerus grandis, L. maximus) are the largest, with total measurements exceeding 3-1/2 inches (9 centimeters).
Why does light travel in straight lines give with evidence?
Yes there is. Your shadow is the simplest evidence that light travels in straight line.
A solar eclipse is also evidence that light travels in straight lines, as is the fact that you cannot see around corners unless you use a mirror.
What do you do in order to measure the volume of rock?
Fill a beaker or measuring cylinder with water and record the volume of water indicated.
Put the rock in the beaker/measuring cylinder and record the new volume of water indicated.
The difference between the two volumes is the volume of the rock.
What is the ozone that separates the mesosphere from the layer below it is called the?
The ozone layer that separates the mesosphere from the layer below it is called the stratopause. It serves as a boundary between the stratosphere and the mesosphere, and is characterized by a temperature inversion where temperatures increase with altitude.
Some bacteria in the human colon has not been identfied the resaon being culturing it. There is a mathemetical calculation i hear back in A levels that was done. But roughly there is 600-1000 species in a human colon and some are still being discovered
What is the chemical formula for red cabbage?
there is no chemical formula for red cabbage itself, but there is a chemical formula for red cabbage extract
When was solar power developed?
Commercial concentrated solar power plants were first developed in the 1980s
In the 1950's the Bell corporation was the first to develop the solar cell
a Swiss scientist named Horace de Saussure began studying the potential of solar energy. In 1767, he was recognized for developing a solar energy collector
Around 1904, American Henry Willsie was recognized as the first person to store energy generated during the day so that it could be used at night
Cells are estimated to have emerged around 3.5 billion years ago during the early stages of life on Earth. The first cells were likely simple prokaryotic cells, and over time, more complex eukaryotic cells evolved through processes like endosymbiosis.
What periodic element are named after the king of the sea?
The element named after the king of the sea is "Neptunium," which is a transuranic element with the atomic number 93. It was named after the planet Neptune, which in turn was named after the Roman god of the sea.
We as humans have successfully cloned a sheep I am sure the name 'Dolly' comes to mind. But as for cloning another human being; ethics has gotten in the way of such an achievement, but it IS possible.but scientists observed that a cloned being is prone to infections and diseases..
Does phosphatidylethanolamine and phosphatidylserine have negative charges?
Phosphatidylethanolamine does not have a negative charge, while phosphatidylserine does have a negative charge at physiological pH due to its carboxyl group.
Why does a river have nuclear energy?
Rivers do not naturally have nuclear energy. Nuclear energy is generated through nuclear reactions in power plants, not from rivers themselves. Rivers may be used for cooling purposes in nuclear power plants, but they do not generate nuclear energy on their own.
If water instantly vaporizes in space why do comets last for so long?
Comets are made of ice, dust, and rock. When a comet approaches the sun, the heat causes the ice to vaporize, creating a cloud called a coma and a tail. This process can make comets visible from Earth for a long time even though their ice is being continuously vaporized.
Does bread with peanut butter mold faster than bread with jelly?
It depends on various factors such as storage conditions, moisture content, and preservatives present in the peanut butter and jelly. In general, both bread with peanut butter and bread with jelly can mold at a similar rate if not stored properly.
What is physmatology and how is it studied with borosil mansingh survismeter?
The physmatology stands for Physicochemical technology of material sciences. It structurally characterizes the molecular mixtures prepared in different polar media.
Currently biotechnology stands for science and technology of routine activities but the physmatology is unique and faithful device.
physmatology and friccohesity go hand in hand and are being measured with borosil Mansingh survismeter. The science grows in a manner that talent and creativity also grow mutually.
What is the tallest ten year old?
5 foot 3
No, it would definitely be much taller, probably around six feet tall.
im 10 and im 5 foot 9 inches
How purple light affects plant growth?
We've had local food, organic food, slow food and even urban farming. Now get ready for disco farming.
The Dutch "plant control freaks" behind PlantLab want to farm indoors under purple light. It's not just for the looks, though. PlantLab has recently developed a set of technologies for optimal indoor farming so that food can grow anywhere from the sunless heart of an office building to an abandoned factory. Picture a 5-star hotel for lettuce, as opposed to the motel provided by a standard glasshouse.
PlantLab stacks "Plant Production Units" on top of each other to make maximum use of space. Plants don't need the entire light spectrum of sunlight to produce energy, so PlantLab uses LED lighting which emits only blue and red light, giving the growing rooms a weird, disco-like atmosphere.
Because of the indoor growing environment, no pesticides are required and 90 percent less water is used than in greenhouse growing. In the traditional glasshouse, the temperature rises when the sun shines on the glass so the plants need to be cooled with water. Inside a Plantlab growing room, the temperature is much lower and the conditions are kept constant, eliminating the need for water-based cooling.
Automation software controls the environment to provide each plant with optimal levels of light, water, heat, humidity and nutrition and dozens of other growing parameters. The company has developed mathematical models, called Plant IDs, for each plant type, which automatically control the 56 different environment parameters in a production unit to ensure optimal growth.
The first indoor city farm using PlantLabs' technology will be in a disused factory in Amsterdam. It's run by Philip Traa and NwA architects.
"We are starting a cooperative," says Traa, "where Amsterdam members pay us a membership fee every year and then buy the vegetables at cost. Indoor farming must be transparent for customers so they can come and see and taste in our city farm."
The first crops are lettuce, herbs, tomatoes, peppers, herbs and cress. Harvesting will start at the end of 2011. The farm will provide 2,000 Amsterdammers with a regular supply of vegetables.
The advantages for cities could be considerable, in terms of reducing traffic and making better use of currently disused space. Amsterdam, for example, has 1.4 million square meters of vacant office space.
"If you grow in the middle of the city where the market is, you have less transportation and lower CO2 emissions," explains Traa. "A glasshouse is only one floor. We can grow on 100 floors in a skyscraper, or in the heart of the building, since you don't need sunlight. Solar panels on the side of the building can provide energy for growing."
Globally, Traa sees the Middle East as the biggest potential market because outdoor growing conditions are so harsh there. Other high-potential areas are China, South Korea and Japan. "Japan has little farmland. China has so many people to feed in the cities. South Korea has both big cities and not enough farmland," Traa explains.
PlantLab's approach to growing food indoors currently costs more than alternatives like glasshouses, since LED lighting is expensive and a considerable amount of energy is required to run the plant production units. The Amsterdam farm will use approximately 1 megawatt of electricity per year, the equivalent of around 1,000 homes.
"To be sustainable, that megawatt needs to be green," Traa maintains. "We think the energy required will be 25-30 percent less in 2 years."
But the energy requirements of the plant production units could be offset by location. A large part of the energy currently used in food production is spent on transport, with supermarket fruit and vegetables clocking up massive numbers of gasoline-powered food miles. Also, LED lighting and solar panels may get cheaper while oil prices are likely to rise, which should increase the attractiveness of PlantLab's solution. Also, since indoor growing is predictable, food can also be grown on demand leading to less waste and stable pricing.
PlantLabs' vision is a strange combination of hyper-intensive farming with local growing using no pesticides. It's energy-intensive, but then so are glasshouses and flying in blueberries from Africa. 1 billion people already don't get enough to eat and the world needs to produce 100 percent more food by 2050 to feed the growing population.
"When you want to feed the world you need to grow intensively," says Traa. "The organic way is only a solution in the Western world."
The green heart of the future city may be in a sunless baseme
How much water should you use to make an object float?
The amount of water needed to make an object float depends on the object's density and volume. The volume of water displaced by the object should be equal to or greater than the volume of the object for it to float. Adding more water will increase the buoyant force.
