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.
Currently the world's longest tunnel is Japan's Seikan tunnel which links the main island of Honshu with Hokkaido and is 33 miles (53km) in length, closely beating the Channel Tunnel which is 31 miles (49km) long.