Taking a liquid item in flight is a big "No, No" from most of the countries around in the world. But each country has their own set of rules and regulation to take care of this issue. But do you know why liquid is not allowed in planes? Here is the reason.
The security concern is the primary reason for not allowing liquids on flights. On few of the busiest airport, more than 100,000 travelers process each day, and it's nearly impossible for airport crews to go through each of the stuff passengers carry.
There are lots of liquid that looks exactly like some harmless liquid (water) but posses a bigger risk to traveling with.
As you can see the chemical Hydrazine hydrate looks exactly like water, and it's nearly impossible to distinguish between both of them.
But Hydrazine hydrate is used in Rocket propellant and is highly explosive and just need a little rise in temperature to become active and explode.
What your opinion about Isopropyl nitrate? Don't you think it also looks like water but is highly explosive in nature?
Now you can understand how much it is going to be a pain in a** for the airport security to look through each traveler's bags and test what they are carrying with them.
With more than 100,000 visits per day in the busiest airports, it becomes nearly impossible to resolve this issue. This is why airport security has used a curtain solution to not allow any liquid with you while traveling in planes.
Security checks at airports are still a hefty time taking process, and you can imagine how it is going to increase exponentially when they have to go through your bottles to figure out what you are carrying with yourself.
Is their any exception or can i travel with any other liquid items ?
There are few exceptions that airport security allows you to travel with some types of liquid. Example,
For Carry On - You can carry 3.4 ounces (100 ml) or smaller sized containers that fit in 1 quart-sized, resealable bag may go in carry on and through checkpoint security.
For Checked Luggage - Containers that are larger than 3.4 ounces (100 ml) regardless of amount inside must be in checked baggage.
Other exceptions are medicines, but you need to carry the prescription of the doctor also to get it permitted otherwise you can't take it with you.
Baby Nourishment foods are also another exception you can travel.
All of the things mentioned above needs to be packed in transparent plastic without the sign of any tamper with it.
That's all you need to know about why liquids are not allowed in planes. So next time when you are going on a trip just check what you need to carry and what not.