What are the differences between pulmonary hypertension vs ARDS?

1- Is ARDS caused by inflammation? Explain your answer.
2- What are the differences between pulmonary hypertension vs ARDS?
3- The Forced Expiratory Lung Volume (FEV1) and the Forced Vital Capacity (FVC) are important factors in pulmonary conditions. What does it mean when the values are increased and decreased?
4- What is Fickes Law?