When the temperature at sea level is 10°C, what is the temperature of the air at a height of 2000 metres above sea level?

As a general rule, the temperature decreases by about 6.5°C for every 1000 meters increase in altitude. So, to find the temperature of the air at a height of 2000 meters above sea level, we need to calculate how many 1000 meter increments there are between sea level and 2000 meters, and then multiply that by the temperature decrease per increment. In this case, there are two 1000 meter increments between sea level and 2000 meters. So, the temperature would decrease by approximately 6.5°C x 2 = 13°C. If the temperature at sea level is 10°C, then subtracting 13°C from it gives us a temperature of -3°C at a height of 2000 meters above sea level. However, it's important to note that this is a general rule and the actual temperature at any given altitude can be affected by a variety of factors, including wind, humidity, and air pressure.