James Clerk Maxwell, in 1861–64, published his theory of electromagnetic fields and radiation, which shows that light has momentum and thus can exert pressure on objects.

2011
Grover Swartzlander first began to examine a revolutionary concept in optical physics after studying the flight of a moth. He watched the animal use its wings to create lift, which led to flight. Swartzlander asked a simple question: Could light be used to create the same effect?
http://www.rit.edu/news/athenaeum_story.php?id=48123

SI units :
ENERGY / SPACE = [ Joul / cubic meters = Newton *meter / cubic meters = N/m^2 ]


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