The atoms or molecules causing the pressure have fewer interactions with the container. In meteorology the lower pressure air can not hold as much moisture so some moisture may fall as precipitation. In psychology the mind usually gets more relaxed.
pressure will increase
Your question has an error, the pressure increases as area of pipe decreases or the pressure decreases as the area of pipe increases. Answer: Conservation of energy
The pressure increases as the volume decreases, so when the pipe is changed from large to small, the pressure of the gas will increase.
As you move from the bottom to the top of the mountain, the air pressure decreases.
it decreases
it will be very cold and the temprature will decreases to zero
pressure will increase
it will be cold
water pressure goes down because the force of the water going through the space decreases
As pressure increases, temperature increases and volume decreases.
Typically expand and/or cool.
volume decreases until the gas condenses to a liquid,
Assuming the temperature stays constant and there is no leakage of gas, then if the container decreases in size then the pressure will increase.
it decreases
As you climb the mountain, the air pressure decreases. The temperature also drops.
The bubble decreases in size and may even be reabsorbed by the liquid.
when the density decreases then the object tends to come up.and when when the air pressure out side decreases too then it wont...so nothing would happen to the object