Which statements about contact angle and capillary behaviour are correct?

Select all that apply

• Option A

  For a wetting liquid, the contact angle is usually less than 90°.

• Option B

  A non-wetting liquid can show capillary depression.

• Option C

  For a given liquid under fixed effective gravity, capillary height varies as cosθ/r.

• Option D

  At contact angle 90°, the ideal capillary rise or depression is zero.