Looking at the grass in the distance in the morning, is it frost or fog?

In the morning, the grass in the distance looks white, which is usually frost rather than fog. The formation of frost is the ground condensation phenomenon on water vapor objects near the ground, which is mostly formed on sunny days, which is often called "thick frost is fierce in the sun"; It also forms at night, and in a few cases, when the sun sets before sunset, frost can also begin to form. It usually appears in the morning when the temperature is close to or below freezing point, especially in autumn and winter. Fog, on the other hand, is formed by condensation of water vapor in the air, usually water droplets or ice crystals formed by supersaturation of water vapor in the atmosphere near the ground, which is a weather phenomenon. Fog usually forms when the temperature is near or above freezing point, especially in the morning and evening of spring and autumn and early morning of winter. Therefore, the whiteness of grass in the morning is more likely to be frost than fog.