| 41. | The contact angle the droplet had immediately before advancing outward is termed the advancing contact angle.
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| 42. | The contact angles at which spreading / imbibition occurs are between 0 and ? / 2.
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| 43. | Human skin, for example, is a hydrophobic surface with a contact angle of about 90 degrees.
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| 44. | Where \ theta is the contact angle.
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| 45. | Choice of \ scriptstyle \ hat n depends on which fluid the contact angle is specified for.
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| 46. | The contact angle the droplet surface makes with the solid horizontal surface decreases from left to right.
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| 47. | Surface energy can be estimated by contact angle measurements using a version of the Young Laplace equation:
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| 48. | The contact angles obtained for hydrophobic surfaces are directly related to surface roughnesses by the Wenzel equation.
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| 49. | Bird feathers and lotus leaves are considered superhydrophobic, with contact angles of 150 and 170 degrees, respectively.
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| 50. | The thickness of a puddle of liquid on a surface whose contact angle is 180?is given by:
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