how a pressure cooker works?

Answer 1

Just as water boils at a lower temperature at the lower pressures of places like Denver, conversely water boils at higher temperatures when the pressure is higher than "normal" which is one atmosphere. A pressure cooker is contained so that the pressure inside can build up and thus cook food at temperatures higher than, say, the 212 degrees Fahrenheit at which water usually boils at sea level. It thus cooks faster and is at the opposite end of the spectrum of cooking from "slow cookers" ( which cook at LOWER temperatures ).

Answer 2

To know how a pressure cooker works you must know the physics behind it. The boiling point of water is 100°C. When boiling with in a pot with no cap, no matter how much you heat, it will never go past the temperature of 100°C because of evaporation. Also the vaporized steam is the same temperature of the boiling water. So when you cook with a pot of water this time with a sealed cap, as you try to add more heat by increasing the temp., all that will happen is that the vapor will try to escape but because it is a sealed environment it will not be able to escape resulting in the build up of pressure (or force/area). The temperature and pressure will have a direct proportional relationship so as one increase so does the other. Also steam has 6 times the heat potential when it condenses (changes from gas to liquid state of matter) on a cold food product. The build up of pressure and heat potential are two factors which enable pressure cookers to cook foods faster and more efficiently.

Answer 3

Pressure cooking – a method of cooking in which a special vessel changes (increase or decrease) the boiling temperature of the water or any other liquid ingredient inside the pot, cooking the food more faster than ever. Pressure cooking is accomplished with none other than pressure cooker. The pressure cooker makes pressure cooking possible as it seals through the pressure and steam bringing to the right boiling point appropriate for the dish being cooked; this will depend on the settings chosen by the user for electric pressure cookers and low-heat temperature for stove-top pressure cookers.

Answer 4

Pressure Cooker works because of pressure inside created by steam.Liquids when heated get converted into gas like water gets converted into steam.The way liquids ans gases
get heated is called convection and the way solids get heated
is called conduction.When you keep the pressure in the gas stove the water gets heated to get converted to steam since in expanded form it creates a lot of pressure inside, so much pressure that the food inside gets heated to get cooked. When there is excess pressure the steam escapes out of the release valve,
where if you have placed a weight.Only when there is excess pressure enough to push it it comes out .Till then the food gets cooked.The release valve is there so that the steam doesn't put pressure on the lid making it to forcibly push the lid causing a loud noise.The emergency valve is also there if
the release valve fails and the cavity in the above is filled with
metal which has a low melting point.

Answer 5

PV=nRT is the Ideal Gas Law

P= pressure
V= volume
n = amount of substance
R= gas constant
T= temperature

So in a pressure cooker we can assume the volume and amount of substance are constants. R is a constant so that makes the equation simple. Pressure is directly related to Temperature. Increasing the pressure, directly increases the temperature. That's why a pressure cooker can get so hot and that's why it cooks so fast.

Peace

Answer 6

see it works on the priciple of black colour getting i mean absorbing more of heat and thats why they are painted black so that they absorb the maximum heat and converts heat energy into elctricity.
and if u want to have more information then u can visit on the site www.google.com-wikipedia-solar cooker. and u can as much information as much u need.

Answer 7

well..due to pressure inside..just notice the screws attached to the pot as well as the thickness of it,the pressure was trapped inside just enough to cook faster..

Answer 8

http://en.wikipedia.org/wiki/Pressure_cooker#Operation