Step1: inhale and seal all the air in the volume chamber, and the compression begins;
Step 2: continue to compress to the center point of the volume cavity;
Step3: compress the air to the center of the volume chamber, and the exhaust will begin soon;
Step4: exhaust, end of a compression process
Step1: inhale and seal all the air in the volume chamber, and the compression begins;
Step 2: continue to compress to the center point of the volume cavity;
Step3: compress the air to the center of the volume chamber, and the exhaust will begin soon;
Step4: exhaust, end of a compression process
