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Dust
is an aerosol, representing aerodynamic system in which disperse medium is air, and a 
disperse phase – dust particles.
The pneumoconiosis
is a disease of lungs in which at long entering of dust nodous or 
diffuse and sclerotic educations (interstitial) forms of a pulmonary dust fibrosis are formed. 
Gravity of work
is the characteristic of labor process reflecting a primary load on the 
musculoskeletal system and functional systems of an organism (cardiovascular, respiratory, etc.) 
providing its activity. 
Tension of work 
is the characteristic of labor process reflecting a load mainly on the central 
nervous system, sense organs, the emotional sphere of the worker.
The physiology of work
is the science devoted to studying of changes of a functional 
condition of a human body under the influence of its work in other words is the science studying 
reactions of an organism in work. 
Working capacity
is an ability of the person to perform work during perhaps long time at 
permanently quality and quantitative indices.
The training
is the general changes in an organism resulting from repeated performance of 
work and leading to working capacity rising. 
Exercise 
is processes in an organism which are expressed in rising of working capacity on 
strictly certain activity. Exercise, therefore, is a special case of a training. 
The fatigue
is a set of the reversible processes in an organism resulting from long or hard 
work and leading to working capacity dropping i.e. this temporary, reversible depression of working 
capacity under the influence of work. 
Primary fatigue
(acute fatigue) is a fatigue which results from performance of unusual, 
very hard dynamic or static work.
The secondary fatigue
is a fatigue which develops as a result of performance of habitual, 
but too continuous duty.