The amount of water vapor present in the air called humidity. The water vapor present in the air in gaseous form, It usually undetectable to the human eye.
Absolute temp = Celcius + 273.15.
| Activity | Temperature (°C) | Relative humidity (%) | Activity | Temperature ( °C) | Relative humidity (%) |
| Backery | Leather | 1 | |||
| Biscuits and cookies | 16-18 | 50 | Storage room | 10-16 | 40-60 |
| Fermentation | 24-27 | 70-75 | |||
| Flour storage room | 18-27 | 50-65 | Libraries and Museums | 21-27 | 40-50 |
| Bread cooler | 21 | 60-70 | |||
| Confectionery | 24-27 | 65-70 | Paper products | ||
| Mixing bread dough | 24-27 | 40-50 | Binding | 21 | 50-65 |
| Yeast storage room | 0-7 | 60-75 | Wrinkling | 24 | 60-65 |
| Printing office | 24-27 | 45-55 | |||
| Granes | Storage room | 24-27 | 40-60 | ||
| Packing | 24-27 | 45-50 | |||
| Textile | |||||
| Confectionery | Cotton processing | 24-27 | 50-55 | ||
| Chocolate sales | 17-18 | 50-65 | Cotton spinning | 16-27 | 50-70 |
| Storage room | 16-20 | 50-65 | Articficial silk spinning | 20-24 | 85 |
| Cotton weaving | 27 | 56-60 | |||
| Food industries | Wire torsie articficial silk | 21 | 60 | ||
Apple storage room | -1 | 75-85 | Silk processing | 24-27 | 65-70 |
| Banana ripening | 20 | 90-95 | Wool refining | 27-29 | 65-70 |
| Banana storage room | 16 | 85-90 | Wool spinning | 27-29 | 50-60 |
| Citrus fruits storage room | 16 | 85 | Wool weaving | 27-29 | 60 |
| Eggs storage room | 2-13 | 75-80 | |||
| Granes storage room | 16 | 30-45 | |||
| Mushrooms storage room | 0-2 | 80-85 | Tabacco | ||
| Potatoes storage room | 4-16 | 85-90 | Sigars and sigarettes | 21 | 55-65 |
| Sugar | 27 | 30 | Processing and storage | 24 | 70-75 |
| Tomatoes storage room | 1 | 85 | Packing | 32 | 88-95 |
| Tomatoes riping room | 21 | 85 | |||
| Wood processing | |||||
| Hospitals | End products | 18-21 | 35-40 | ||
| Children’s ward | 24 | 50-65 | Fixing | 24-24 | 40-50 |
| Operation room | 24 | 55 | Processing | 18-24 | 35-40 |
| Hospital rooms | 24 | 40-50 | |||
| Conservatories | 27 | 70-80 | |||
| Painting companies | 22-24 | 40-50 |