Assuming mass does not also increase, then density decreases if volume increases. For example, let's say Mass= 100 and Volume= 50 Density would = 2 Now, lets increase the voluâ¦me. Mass would still = 100, and let's increase the volume to 75. Density would then equal 1.333... 2 is greater than 1.333....
Definition of wind tunnel. : a tunnellike passage through which air is blown at a known velocity to investigate air flow around an object (such as an airplane part or model) placed in the passage.
The first wind tunnels were just ducts with fans at one end. These tunnels made choppy, uneven air, so engineers steadily worked to improve airflow by tweaking tunnel layouts. Modern tunnels provide much smoother airflow thanks to a fundamental design that incorporates five basic sections: the settling chamber, contraction cone, test section, diffuser and drive section.