Cloud

The color of a cloud tells much about what is going on in the interior of the cloud. Clouds form when relatively warm air containing water vapor is lighter than its nearby air and this causes it to rise. As it rises it cools and the vapor condenses out of the air as micro-droplets. These minute particles of water are fairly densely packed, and sunlight cannot go through far into the cloud before it is reflected out, giving a cloud its attribute white color. As a cloud matures, the droplets may join to produce larger droplets, which may themselves merge to form droplets large enough to fall as rain. In this process of accretion, the space between droplets becomes larger and larger, permitting light to enter much farther into the cloud.

If the cloud is satisfactorily large, and the droplets within are spaced far enough apart, it may be that a percentage of the light which enters the cloud is not reflected back out before it is absorbed .This process of reflection/absorption is what leads to the range of cloud color from white through grey through black. For the same reason, the undersides of large clouds and heavy overcasts appear various degrees of grey; little light is being reflected or transmitted back to the observer.

Elevator

An elevator is a transport tool used to move goods or people up and down. Outside North America, elevators are known most commonly as lifts. Other languages may have loanwords based on moreover elevator or lift .Because of wheelchair right to use laws, elevators are often a requirement in new buildings with multiple floors. Elevators start on as simple rope or chain hoists.

An elevator is basically a platform that is either pulled or pushed up by mechanical resources. A modern day elevator consists of a cab mounted on a platform within an together with this space called a shaft, or in Commonwealth English called a hoist way. In the past, elevator drive mechanisms were mechanical by steam and water hydraulic pistons. In a traction elevator, cars are pulled up by means of rolling steel ropes over an extremely grooved pulley, frequently called a sheave in the industry. The weight of the car is intention with a counterweight. Sometimes two elevators move forever synchronized in opposite way, and they are each other's counterweight.

Block

In computing, block size indicates a nominal size, usually expressed in bytes or bits, of a mass of data. Data thus controlled is said to be blocked. The process of putting data into blocks is called blocking. Blocking is used to assist the handling of the data-stream by the computer program receiving the data. Blocked data is generally read a block at a time. Blocking is almost universally employed when storing data to 9-track magnetic tape, to turning media such as floppy disks, hard disks, and optical discs, and to NAND flash memory.
Block storage is normally abstract by a file system or database management system for use by applications and end users. Database management systems(DBMS) often use their own Block I/O for superior performance and recoverability as compare to layering the DBMS on top of a file system.