1) (a) what happens to the volume of the lungs when they expand? (b) Explain why air is sucked into the lungs (need to explain about the gas pressure)

PLS HELP THXX A LOTT
the topic is related to gas presssure
thx soo much for helping

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)