During inhalation, the pressure in the thoracic cavity?

During inhalation, the diaphragm and intercostal muscles contract, which leads to the expansion of the thoracic cavity. As the volume of the thoracic cavity increases, the pressure within it decreases in accordance with Boyle's Law, which states that at a constant temperature, the pressure of a gas is inversely proportional to its volume. When the pressure in the thoracic cavity falls below atmospheric pressure, air flows into the lungs from the outside environment. This process is essential for breathing and allows for oxygen to be drawn into the respiratory system, making reduced pressure during inhalation a fundamental aspect of respiratory physiology.