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252

Centuries: 2nd century - 3rd century - 4th century

Decades: 200s 210s 220s 230s 240s - 250s - 260s 270s 280s 290s 300s

Years: 247 248 249 250 251 - 252 - 253 254 255 256 257


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Surface tension

... elastic sheet. It is the force that supports insects that walk on water, for example. Surface tension is caused by the attraction between the molecules of the liquid. ...