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.
In addition to their annual salary all legislators and the lieutenant governor receive a per diem personal allowance of $128 for every day the legislature is in session (both regular and special sessions). This adds up to $17,920 for the regular 140-day session.enators and representatives alike earn only $7,200 per year, or $14,400 for a two-year legislative period. Some may consider this salary generous, since after all legislators work only for 140 days over two years. However, this salary equals just slightly over $100 per day.