Name:rachel seah
Age:13++
Class: 2-2
blog:science purposes (Go science!:D)
Hi, this marks the work and research of various science topics during ACE Science Program from 2009 - 2010. Do have a look around and if there are various discrepancies, do inform me. :) Many thanks and cheers!
{Friday, May 8, 2009 . Filtration and reverse osmosis}
Reverse osmosis is a filtration process that is often used for water. It works by using pressure to force a solution through a membrane, retaining the solute on one side and allowing the pure solvent to pass to the other side. This is the reverse of the normal osmosis process, which is the natural movement of solvent from an area of low solute concentration, through a membrane, to an area of high solute concentration when no external pressure is applied.
A video on reverse osmosis. (PS:please see the video starting from 50 seconds as the first 50 seconds was really boring...)
This is another video on water filtration methods and they say you have to turn on your computer sound to hear it clearly. Actually, there is no need as the video has words on it which is roughly what the person is trying to talk about. :D enjoy~
rachel blogged on 5:22 AM
This trefoil is the hazard symbol for radioactive material. Don't go near it, there will be bad after-effects.
This is the hazard symbol for toxic substances. Don't touch it or drink it!
This symbol accompanies explosive materials. Beware of it...
This is the symbol for a biohazard, or a material which represents a threat to cellular materials or living organisms. Trust me, you DO NOT want to touch it in.
rachel blogged on 5:15 AM
This is a picture of a nuclear bomb:
Scary isn't it? Science is helpful to mankind but dangerous in the hand of others. This is a video of an atomic bomb:
Remember, war is not the answer to everything. With power comes responsibility so in a way, if you got important knowledge, use it wisely.
Chemical warfare is different from the use of conventional weapons or nuclear weapons because the destructive effects of chemical weapons are not primarily due to any explosive force. The offensive use of living organisms (such as anthrax) is considered biological warfare rather than chemical warfare; however, the use of nonliving toxic products produced by living organisms (e.g. toxins such as botulinum toxin, ricin, and saxitoxin) is considered chemical warfare under the provisions of the Chemical Weapons Convention. Under this Convention, any toxic chemical, regardless of its origin, is considered a chemical weapon unless it is used for purposes that are not prohibited
