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Flash chromatography uses pressure (under 10 psi) to pump solvent down a column at a rate faster than gravity would provide. Vacuum chromatography uses a vacuum at the bottom of the column to pull solvent through. Both can be performed with standard glass columns, but usually vacuum chromatography is done with a silica filled vacuum funnel instead as a rough purification technique.
What else can I help you with?
What is the difference between flash chromatography and column chromatography?
Column chromatography, is a broad term for all column chromatography methods, but is also synonomous with Gravity fed methods. Flash chromotography refers specifically to a column in which the eluant (or mobile phase) is moved through the column under pressure (using a hand pump for small scale, or a pressurised gas for a larger scale), the name Flash is derived from how much faster it is to run a column under pressure than via gravity.
Why does lightning strick?
Lightning is a build up of static electricity. The lightning flash is a very short natural electrical discharge between the thunder clouds and the ground, or from cloud to cloud. The route taken by the lightning creates a vacuum, and the roll of thunder sound is the surrounding air crashing back to refill the vacuum.
In what way is the time difference between the arrival of p waves an s waves at the seismograph station like the time difference between a lightening flash and thunder?
The difference in arrival of P and S waves on a seismogram tells seismologists how far away the away the source of the quake is from the recording station. A little more detail! P-waves travel more quickly through the Earth than S-waves. As such the further away the seismometer is from an earthquake epicentre the greater the amount of distance the S-waves lag behind the P-waves. The same is true for lightning. The flash is visible light which is a form of electromagnetic wave and travels so quickly (approx. 300x106 m/s) that you see it (at what may as well be described as) instantly. However sound waves travel much more slowly (approx. 330 m/s in air), roughly a million times slower than light. As such there is a significant lag time between seeing the flash and hearing the resultant clap of thunder.
What is the electrical discharge between a cloud and the ground?
The electrical discharge between a cloud and the ground is known as lightning. It occurs when there is a difference in electrical charge between the cloud and the ground, and is typically accompanied by a bright flash and thunder. Lightning is a powerful natural phenomenon that can be dangerous and destructive.
What does the time difference between thunder and lightning mean?
It means that the light-flash of the event traveled to you faster than the soundof it was able to travel.That's confirmed by some information from Physics, where we learn that light travelsabout 800 thousand times faster through air than sound does.
What is the difference between flash chromatography and column chromatography?
Column chromatography, is a broad term for all column chromatography methods, but is also synonomous with Gravity fed methods. Flash chromotography refers specifically to a column in which the eluant (or mobile phase) is moved through the column under pressure (using a hand pump for small scale, or a pressurised gas for a larger scale), the name Flash is derived from how much faster it is to run a column under pressure than via gravity.
What is the difference between a USB Flash drive and a pen drive?
There is no difference. Flash drive, pen drive, and thumb drive are all interchangeable terms.
What is the flash point difference between diesel and gasoline?
The flash point difference between diesel and gasoline is that diesel has a higher flash point than gasoline. Diesel typically has a flash point of around 125-180 degrees Celsius, while gasoline has a flash point of around -40 to -60 degrees Celsius.
What is the difference between a flash drive and hard drive?
lol really
What is the difference between flash ram and flash rom?
Flash RAM is used for temporary data, such as in a USB drive. Flash ROM is used for bios and system files.
What is the purpose of an alumina column?
Column chromatography is generally used as a purification technique: it isolates desired compounds from a mixture.Column chromatography is separated into two categories, depending on how the solvent flows down the column. If the solvent is allowed to flow down the column by gravity, or percolation, it is called gravity column chromatography. If the solvent is forced down the column by positive air pressure, it is called flash chromatography, a "state of the art" method currently used in organic chemistry research laboratories The term "flash chromatography" was coined by Professor W. Clark Still because it can be done in a "flash."
What is the difference between a flash drive and a flash player?
A flash drive is solid state drive that is intended to store data. A flash player is a software program that plays videos in a flash video format.
Difference between pen drive and a usb flash drive?
only the name is different
What is the difference between a flash disc and a USB port?
what is the diference between a computer internal memory and external memory
What is the difference between floods and flash floods?
Flash floods are floods that are caused by a storm. Normal floods are caused by non-stop rain.
How does a vacuum flash work?
A vacuum flask works by using a double-wall design with a vacuum between the walls. This vacuum acts as an insulator, preventing heat transfer through conduction and convection. This helps to keep hot liquids hot and cold liquids cold for an extended period of time.
What is the difference between super smash flash and super smash flash exe?
SSF is a game that can only be played online, but SSF.EXE can be downloaded onto your computer.
