Critical release altitude

The theoretical curves, 1, corresponding to a non-contaminated rubber surface, are obtained by the following procedure. For each ball, the critical release altitude was accurately measured so that the mean value of the parameter , product of the temperature factor and the Dupr energy of adhesion, was correctly determined ... 

As a consequence, the existence of this master curve validates the model, particularly the dependence of the ratio A/B upon the curvature radius R and the mass M of the projectiles. This ratio varies as /T, hence, the critical release altitude ho, below which sticking occurs, varies as(v4/B) , a negative power of R which is consistent with the recent theory of Johnson and Pollock 25). 

Ambient conditions such as heat, and thus the time of day in which an agent is released, are critical elements in deployment. If released at a high altitude, agent particles may not be able to reach sufficient concentrations to inflict casualties. Humidity can also affect dispersal some CW agent particles, absorbing moisture from the air, become too heavy and fall harmlessly on the ground, while rain can wash the air and even neutralize by hydrolysis (albeit slowly) many CW agents. 

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