The water window is a region of the electromagnetic spectrum in which water is transparent[clarification needed] to soft x-rays.
The window extends from the K-absorption edge of carbon at 282 eV (68 PHz, 4.40 nm wavelength) to the K-edge of oxygen at 533 eV (129 PHz, 2.33 nm wavelength).
Water is transparent to these X-rays, but carbon and its organic compounds are absorbing.
These wavelengths could be used in an x-ray microscope for viewing living specimens.
[1][2] This is technically challenging because few if any viable lens materials are available above extreme ultraviolet.