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.
1 All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. 2  Extensive properties, such as mass and volume, depend on the amount of matter being measured.  Intensive properties, such as density and color, do not depend on the amount of the substance present.