Русско-английский научно-технический словарь
удар
• Each impact of a molecule with (or on) a wall of the container ...
• The impact of the fluid may either tend to close or open the valve.
• Meteoric impacts (or hits) upon the skin of a rocket ...
• Radioactive dust particles ... collected by impaction against the adhesive surface ...
• Leaky valves often result from pounding of valves against their seats.
• A hammer blow on hard rock ...