As altitude increases, the available amount of oxygen to sustain mental and physical alertness decreases with the overall air pressure, though the relative percentage of oxygen in air, at about 21%, remains practically unchanged up to 21,000 metres (70,000 ft).
  State legislators in Texas (both representatives and senators) make a salary of $7,200 per year.
But an examination of state records shows that most make considerably more than their base salary. With extra pay for chairmanships and other posts, they earn just over $90,000, on average, for what is widely considered a part-time job; the Legislature is in regular session for 63 days a year.ssembly Democrats are pushing most vociferously for the raise because they make less, on average, than their Republican counterparts. With more than 100 members, dozens of them earn only the base salary of $79,500.