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Miscellaneous
The Miscellaneous category is for a wide variety of questions and answers that we find important, but that have not found a home in one of our specific categories.
14,596 Questions
Black paper absorbs all wavelengths of light, so it reflects and transmits very little light. Colored filters will reflect and transmit specific wavelengths of light based on their molecular structure, absorbing all other wavelengths.
What is the average weight of an 83 inch Atlantic sailfish?
Using several charts online, it appears that a fish of that length will weigh in the 90 lb range. Hope that helps!
How can activated charcoal be cleaned and reused?
Cleaning of Activated Carbon/Charcoal (AC) is actually quite complicated, and can be a bit 'hit and miss'.
For most applications it may be adequate to soak it for 48 hours in 9-10% hydrogen peroxide, stirring regularly, and replenishing the solution several times. Then bake in a hot oven for an hour or two. The peroxide is very reactive and helps break down protein, bacteria, and organic compounds, and the baking drives them off....
This could be adequate for most 'home uses' where the quality of the cleaning is not of high importance (for example: use in home water filters, fish tanks, or to purify distilled alcohol).
Care should be taken when using cleaned or re-charged AC. Without sophisticated testing equipment, measuring the efficiency of the re-charged AC is very difficult. 'Sniff' testing filtered fish tank water and or purified alcohol may be possible for an experienced fish or alcohol aficionados where the removed compounds would otherwise leave some residual odour.
More specifically, the regeneration of AC depends on what the carbon has been removing, and how important it is that it continues to function 100% perfectly. Without a complete understanding of what has been removed by the AC, cleaning is likely to be less than complete. Successive cleanings may reduce the efficiency of the filtration and the AC may cease to adsorb the very materials you are trying to filter.
In many cases, it may be ok to flush it with distilled, de-ionised water, 'bake' the activated carbon in an oven or treat it with super heated steam. Both of these methods can be accomplished at home if you have an oven or a pressure cooker.
Other reactive chemicals are sometimes used to remove the adsorbed substances - resting in a strong solution of hydrogen peroxide, followed by baking may assist with removing more organic contaminants as oxygen liberated from the hydrogen peroxide is very reactive.
The Organic Materials Review Institute (OMRI) has produced a paper on Activated Carbon processing which includes the following:
Carbon can be reused if the adsorbed substances are removed. This process is known as 'regeneration.' Simply heating the spent carbon at a given temperature for an adequate length of time can regenerate activated carbon to the point where it can be reused for tertiary wastewater treatment (thermal regeneration) (Mine Safety Appliance Corp., 1970). Thermal regeneration inevitably results in the loss of carbon (Battelle, 1970). Also, thermal methods may not be the most efficient, inexpensive, or reliable method, so a number of solvents, acids, and alkalis may be employed to remove the adsorbed substances. These include such things as carbon tetrachloride, hydrochloric acid, hydrogen peroxide, potassium hydroxide, sodium hydroxide (Mine Safety Research Corp., 1970). Optimization of the regeneration process depends on the substances adsorbed as well as the structure of the activated carbon
The paper on Activated Charcoal processing linked here:
http:/wwwzperiodzomrizperiodzorg/AC_processing.pdf
Note that a specialist understanding of the process is required if using the cited methods. The chemicals discussed require special handling and treatment to ensure the activated carbon is not left contaminated by acids, alkalis or other chemicals used in the cleaning process.
What can cause a glass to shatter without nothing touching it?
Glass can shatter when you play a high frequency sound wave near by. (i saw it in CSI new york and they were robbing a jewelery store and they played a high frequency sound waves on ipod speakers to shatter the glass)
hopefully this helps :)
A quick wink is about 300 to 400 milliseconds. A slow wink is about 600-700 milliseconds.
Is it possible to spontaneously combust?
There is supposed to have been 200 cases in over 300 years without adequate explanation also in no one it could never be proven but the idea of a human spontaneously catching fire isn't that far fetched either since a human body is just like a candle inside-out also it has never been
redone in a lab.
Why did Rutherford infer the presence of the tiny nucleus?
Rutherford inferred the presence of the tiny nucleus because some alpha particles fired at a thin gold foil were deflected at large angles, suggesting a concentrated positive charge located within a small area. This led him to propose the nuclear model of the atom with a dense central nucleus surrounded by orbiting electrons.
Where do most wild fires happen?
What are the measurements for A1 size paper?
The standard measurements for A1 size paper are 594 x 841 millimeters or 23.4 x 33.1 inches.
Melbourne and Broome time difference?
Melbourne is in the Australian Eastern Standard Time (AEST) zone, while Broome is in the Australian Western Standard Time (AWST) zone. The time difference between Melbourne and Broome is two hours, with Melbourne being two hours ahead of Broome.
How could you get silly string to stick to glass?
You can use a small amount of adhesive like double-sided tape or sticky tack to make silly string stick to glass. Simply apply the adhesive to the glass surface and then press the end of the silly string onto it. This should help the silly string adhere to the glass.
A very good question. Algae is actually the foundation of our entire food
chain and therefore a serious reason people need to be concerned about
what is going on with our oceans. Algae is the simplest form of plant life
on this planet, which derives nourishment directly from the sun, and the
absorbtion of substances in the sea. It is actually beautiful to be in a big
patch of it on a moonlit night, out in the middle of the ocean, because it
glows in the dark. The point is we all basicly derive our energy from the
sun so algae is what converts it to something we can eat. Of course you
can eat the stuff in that form if you want to but it doesn't taste anything
as good as a nice steak and lobster dinner.
What are the names of elements found in grain alcohol?
Grain alcohol, also known as ethanol, is composed of carbon, hydrogen, and oxygen atoms.
Mars' surface is composed of basaltic rock, the mantle of silicic rock.
More stuff can be found on http://www.enchantedlearning.com/subjects/astronomy/planets/mars/
The atmosphere is composed primarily of carbon dioxide with some other gas.
Why are objects lighter in water than in air?
Objects are lighter in water than in air because water exerts an upward buoyant force on objects, counteracting the downward force of gravity. This buoyant force reduces the effective weight of the object in water, making it feel lighter. Objects that are less dense than water will float, while those that are denser will sink.
How do you measure a road on an ordnance survey map?
To measure a road on an Ordnance Survey map, you can use a ruler or a piece of string to follow the road's route. Simply mark the starting point and trace the road's path, then measure the string or ruler against the map's scale to determine the road's length. Alternatively, you can use online mapping tools that offer this feature for more accurate measurements.
Firn is partially compacted snow that has lasted at least one full year and has begun to form into ice. It is an intermediate stage in the glacier formation process between snow and glacier ice, with a density higher than fresh snow but lower than glacial ice. Firn typically becomes glacial ice after undergoing further compaction and recrystallization.
What is the evergreen tree with brown pulpy pods in brittle shells?
The tree you are describing is likely a carob tree (Ceratonia siliqua). Carob trees produce brown pulpy pods within brittle shells that are commonly used in cooking and baking as a chocolate substitute due to their naturally sweet flavor.
What are some treasure map directions?
Some common treasure map directions include "north," "south," "east," and "west," along with more specific instructions like "follow the river upstream," "count the number of palm trees, then turn left," or "walk 50 paces to the old oak tree."
What is the measurement of force?
Force is typically measured in Newtons (N), which is the unit of measurement in the International System of Units (SI). One Newton is equivalent to the force required to accelerate a mass of one kilogram by one meter per second squared.
"Foot" is a unit of length equivalent to 12 inches, commonly used for measuring height. "Linear foot" is a measurement used to describe a length in one dimension, typically used in construction or real estate to specify the length of a straight line (e.g., a wall or fence).
Which side of the body do people sleep on the most?
According to various studies, people sleep most on their sides rather than their back or their stomach. The most common position to sleep in is the fetus position, which is on your side.
