Figure 2: melting and boiling points of some substances
substance melting point boiling point
hydrogen
-259.3°c
-252.9°c
nitrogen
-210.0°c
-195.8°c
acetic acid
16.6°c
117.9°c
gold
1064.2°c
2856°c
26. based on the information in figure 2, which substances would be liquids, solids, and gases at 0°c?

satellites are frequently used to make observations of the orbit on earth

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.