The map always shows the maximum UV index. When you select a city, the maximum UV index is shown by default, but you can switch this to hourly. When you do this, the site selects the nearest hour; e.g. at 9:45, 10:00 will be selected, and at 11:20, it will show the UV index for 11:00.
States of matter are generally described on the basis of qualities that can be seen or felt. Matter that feels hard and maintains a fixed shape is called a solid; matter that feels wet and maintains its volume but not its shape is called a liquid. Matter that can change both shape and volume is called a gas. Some introductory chemistry texts name solids, liquids, and gasses as the three states of matter, but higher level texts recognize plasma as the fourth state of matter. Like a gas, plasma can change its volume and shape, but unlike a gas, it can also change its electrical charge. The same element, compound, or solution can behave very differently depending on its state of matter.
The scene described above has examples of the three most familiar states of matter: solid, liquid, and gas. The states of matter are the physical forms in which a substance can exist. For example, water commonly exists in three states of matter: solid (ice), liquid (water), and gas (steam). Solids Have Definite Shape and Volume . You can notice that marble in a bottle, keeps its original shape and volume. The marbleâs shape and volume stay the same no matter what