what happens to the temperature and pressure in the troposphere as we increase in altitude?

Answer 1

The atmospheric pressure decreases, and the temperature decreases as you increase in altitude.

Answer 2

They both decrease. As altitude increases, there is less air physically above your reference point. Less air (reduced mass) pushing on the same area produces less pressure.

I'm not sure of the physical explaination for temp, but it may be related to fewer air molecules bouncing off one another at high altitude.

Answer 3

To finish Vette77's answer, the decrease in temperature is due to adiabatic expansion. As hot air rises, it quickly expands into the vacuum of the upper atmosphere, causing it to cool down. This phenomenon can be seen when you open a bottle of soda - the compressed CO2 expands quickly, creating a short burst of steam due to the coldness of the expanding gas.

Answer 4

Both decrease with height.The temperature decreases with height because the atmosphere is heated from the bottom.The pressure decreases because the vertical column of air over a place decreases with height resulting in decrease of weight of the column and hence, in the pressure.