According to Boyle's Law, if the temperature of a gas stays constant, does the volume decrease the pressure?
Boyle's Law is a comparison of the relationship between Pressure and Volume of a gas in a closed system and temperature held constant.
Pressure and Volume have an inverse relationship and can be determined through the mathematical equation:
If the volume of a container is increased the pressure of the gas inside the container will decrease as their will be less collisions between the molecules of gas and the walls of the container.
Like wise if the volume of the container were to decrease the pressure of the gas would increase as the molecules would collide more often in the reduced space.
I hope this was helpful.