Think of how, using a medical syringe without a needle, to be convinced by experience that the gas pressure decreases

Think of how, using a medical syringe without a needle, to be convinced by experience that the gas pressure decreases with increasing volume?

If you close the needle hole of the syringe with your finger and pull the piston out, the finger will seem to be drawn into the piston.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.