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Frost is a deposit of ice...
  • A

    With a crystalline appearance, formed when water vapour freezes directly onto a surface that has a temperature at or below 0°C.

  • B

    That is clear, occurs when water droplets freeze directly onto a surface with a temperature at or below 0°C, without regard to the dew point.

  • C

    That is clear, results from the direct freezing of supercooled water droplets onto a surface with both temperature and dew point at or below 0°C.

  • D

    That is formed through the direct freezing of snowflakes onto a surface with a temperature at or below 0°C.

Frost, also known as "hoar frost", is an icy deposit with a crystalline appearance that usually takes on the form of scales, needles, or fans. This deposit is formed through the process of sublimation, whereby water vapor is directly transformed into ice crystals and deposited onto a surface that has a temperature at or below freezing.

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