I saw a traveller on the news complaining that you can't take ANY liquids on the plane. She was dissapointed that you couldn't "X-ray the liquids or something..." to be sure it wasn't explosive material.First of all, explosives ARE explosives because when you add a small amount of kinetic energy to them, they EXPLODE.It would theoretically be possible to carry a liquid that would be detonatable by being x-rayed. Most likely the liquids a terrorist would attempt to use are fuel types or accelerants. Even simple rubbing alcohol can be a powerful explosive when you put it in a soda bottle with pool chlorine. WATCH THIS EXPLOSION:
http://www.youtube.com/watch?v=-ThrXo0SeGoThe problem is, if a hijacker gets ANY type of explosive on a plane, you have no idea how powerful it is until it explodes...the fear alone could cause any number of catastrophes.I personally would rather the airline prohibit chemicals and metals than to be on an airplane and have it get either hijacked or blown up in mid air.