It is also found that the most important factors that influence the frost growth are the temperature of cold plate and relative humidityofair.
实验还发现，对霜层生长初期影响最大的两个因素是冷表面的温度和空气的相对湿度。
2
Whereas refrigerative systems reduce the humidityofair (because some water vapour condenses and is drained away), evaporative coolers increase humidity.
虽然制冷系统会降低空气的湿度(因为凝结作用会带走部分水蒸气)，但是蒸汽冷却器却能够增加空气湿度。
3
Photosynthetic productivity of the leaves is affected by temperature and relative humidityofair as well as directly constrained by intensity of the sunlight.