Editing Goniometer (section)

====Contact angle goniometer====
[[File:Rame-hart goniometer.jpg|thumb|Surface scientists use a contact angle goniometer to measure [[contact angle]], [[surface energy]] and [[surface tension]].]]
[[File:Contact angle measurement with Attension Theta.png|left|alt=Contact angle measurement.|thumb|In a contact angle measurement, the angle between the droplet and solid surface indicates the wettability of the surface.]]
In [[surface science]], an instrument called a contact angle goniometer or [[tensiometer (surface tension)|tensiometer]] measures the static [[contact angle]], advancing and receding contact angles, and sometimes surface tension. The first contact angle goniometer was designed by [[William Zisman]] of the [[United States Naval Research Laboratory]] in [[Washington, D.C.]] and manufactured by ramé-hart (now ramé-hart instrument company), New Jersey, USA. The original manual contact angle goniometer used an eyepiece with a microscope. Today's contact angle goniometer uses a camera and software to capture and analyze the drop shape, and is better suited for dynamic and advanced studies.