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If the volume is reduced, and all else remains the same, then the pressure will increase by a factor of 2, or it will double.
A piston cylinder process actually includes two processes. The gas inside the piston undergoes both the constant pressure process and the contant volume process.
That all depends on the type of gas and volume given for the problem. We can't determine the mass and density of the gas cylinder if we are not given these info, which can also include pressure (because density varies based on that variable).
The equation is P1V1=P2V2. (P1 is pressure before the change, P2 is the pressure after, V1 is the volume before the change, and V2 is the volume after it.) So to solve it, it would be the same change no matter how much the volume and pressure were to begin with. The values are P1= 1 atmosphere (the pressure of air at sea level) V1= 1 Liter which would mean P2=3 atmospheres 1*1=3(V2) 1/3 Liter= V2. So the volume would be one third of what it was before the pressure was tripled.
density, temperature and pressure
Assuming your cylinder is fixed and has something like a piston allowing for potential movement, the volume will remain the same. The gas will become less densed, as with pressure its more dense.
The volume will increase as the piston moves downward. If the cylinder is sealed and the gas can not escape, the pressure in the cylinder will decrease. If the cylinder has a small opening as in a motor, the higher pressure outside will push in air that will mix with fuel to ignite when the spark plug is fired. (Supv note: it is not possible to have negative pressure. You can have zero pressure but not a deficit.)
The volume is halved
the volume doubles
the volume doubles
Volume decrease.
The pressure will increase.
Volume increases
When the temperature of a gas is increased at a constant pressure, its volume increases. When the temperature of a gas is devreased at constnt pressure, its volume decreases.
volume increases
volume increases
volume increases