Figure 7From: A novel mechanical lung model of pulmonary diseases to assist with teaching and training Compliance for different phases. Most of volume change occur in first phase, where bellows are expanding vertically without stretching rubber, resulting in higher compliance. Second phase occurs when the bellow platform reaches maximum height and start to stretch the rubber, resulting in lower compliance. The initial phase is where pressure increases in tube before the air starts to flow into the bellows.Back to article page