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.
House of Representatives 41 The maximum annual salary for employees of committees, as revised in the 2009 pay order, is $172,500 for up to three staff members (two majority and one minority); $170,696 for up to nine staff members (six majority and three minority); and a maximum of $168,411 for other staff.1 The aggregate square footage of office space that can be secured for a Senator ranges from 5,000 square feet, if the population of the state is less than 3 million, to 8,200 square feet, if the stateâs population is 17 million or more. 32 There is no restriction on the number of offices.