Why is it hot when you breathe and cold when you blow?

When you breathe in, the air is warmed by your body temperature as it passes through your respiratory system, making your breath feel hot. In contrast, when you blow air out forcefully, the air is expelled quickly and mixes with the cooler surrounding air, which can make it feel cold. Additionally, the moisture in your breath can further enhance the cooling effect as it evaporates. This difference in temperature sensation is due to the rate of airflow and the interaction with ambient air.