On the typical train, there is no effort to control pressure above or below a train.
Pressure underneath a moving train is lower because of the Bernoulli's principle, which states that as fluid (such as air) moves faster, its pressure decreases. The train's movement creates airflow beneath it, causing the pressure to drop.
Probably for the same reason you don't want to hang out next to a sinking ship or stand under a passing airplane - the air or water nearby is being pushed aside and creating a vortex. The air disturbance along with the ground vibrations may cause you to lose your balance and possibly fall into the passing train and maybe die. When a train is moving at a high speed; the velocity of air increases; according to bernoulli' s theorem, as the velocity increases, the pressure decreases. Thus the place where we are standing is a region of high pressure and the place where the train is moving is a region of low pressure. We are pulled from a region of high to a region of low pressure.
When you blow under a piece of paper, the air flow creates a low-pressure area under the paper, causing it to bend towards the side with higher pressure (usually the top side). The pressure difference between the top and bottom of the paper results in a lifting force that causes the paper to bend.
No, a cyclone is associated with low pressure at its center. Air converges at the center of a cyclone, causing the air to rise and creating a region of low pressure.
The center of a tornado, known as the eye, typically has low pressure. As air converges towards the center, it rises and cools, resulting in the creation of a low-pressure area.
There is nothing that is specifically designed to keep the air pressure low under a train. A train is kept on the tracks by gravity, nothing more.
Pressure underneath a moving train is lower because of the Bernoulli's principle, which states that as fluid (such as air) moves faster, its pressure decreases. The train's movement creates airflow beneath it, causing the pressure to drop.
because if not then you have friction and friction causes massive problems
because if not then you have friction and friction causes massive problems
no, it is under extreme pressure
A solution under high pressure will have more gas dissolved in it than one under low pressure.
Anything expandable/flexible will expand under low pressure. but in order for it to explode I guess you need to contain it within a relatively thin container made of stronger material. eg. balloon
A solution under a high pressure
the solution with higher pressure would have more gas in it that the one with low pressure.
It is under lower pressure, however, it is under pressure enough to compress it into a liquid.
A solution under a high pressure
There are more particles of gas.