What is the standard lapse rate in the troposphere?

• A. 1°C per 1,000 feet of altitude gain
• B. 3°C per 1,000 feet of altitude gain
• C. Approximately 2°C per 1,000 feet of altitude gain
• D. 5°C per 1,000 feet of altitude gain

Answer: (C)

The standard lapse rate in the troposphere is approximately 2°C per 1,000 feet of altitude gain. This means that as you ascend in the troposphere, the temperature decreases at this average rate. This phenomenon occurs because air at higher altitudes is less dense and holds less thermal energy, which results in cooler temperatures.

In practice, the average lapse rate can vary depending on local conditions like humidity and atmospheric pressure, but the standard rate remains a critical factor for pilots and meteorologists when assessing atmospheric stability and predicting weather patterns. Understanding the standard lapse rate is crucial for flight planning and safety, especially when determining altitude adjustments for aircraft operations.