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Dangerous production factor
is a production factor which influence on working can lead 
to a trauma or other sharp deterioration in health or death.
Production rooms
are the closed spaces in specially intended buildings and constructions in 
which it is constant (on changes) or periodically (during the working day) work of people bound to 
participation in different types of production, in the organization, control and production 
management, and also to participation in different types of work at the enterprises of transport, 
communication, etc. is carried out. 
The working zone
is the space limited to the protecting structures of production rooms, 
having height of 2 m over the level of a floor or the platform at which there are places of constant or 
changeable stay of working.
The constant workplace
is a place in which working is the most part (more than 50% or 2 h 
are continuous) of the operating time. 
Weather conditions
are the physical condition of air medium characterized by temperature, 
humidity, a caloradiance of heated bodies and the movement of air. 
Humidity
is the content of water vapor in grams in 1 m3 of air. 
Infrared radiation
is the caloradiance representing the invisible electromagnetic radiation 
with a wavelength from 760 to 540 nanometers having wave, quantum properties. 
The convection
is an immediate return of heat from the surface of a human body to the 
heated layers of air which were less inflowing to it.
Radiation
- it return of heat happens in the direction of surfaces to lower temperature. 
The conduction
is a contact of a surface of the body working with the cooled or heated 
equipment, materials. 
Evaporation
- it return of heat happens by evaporation of moisture from the surface of a 
body of the person.