Data transmission / Data transfer
Data transfer is the process by which data or information from one source travels to a destination via a medium. Data transfer can either be a point to point or multipoint. The channel is the medium used in transfer including copper wires, optical fibers, wireless communication channels, modems, etc.
Data is usually represented as an electromagnetic signal, usually an electrical voltage, radio wave, microwave or infrared signals. The rate of data transfer defines the speed at which one unit of data is transferred per second from one source to a destination. The speed of data transfer is usually measured in bits per second (for digital data) and is based on the medium.
Data transfer speed is measured in various units including those of the device and the standard that is used. There is a particular standard even for Universal Serial Bus controllers (USBs) where the device determines the speed of the data transfer and is designed for that purpose. The online tools available to convert data transfer speeds take inputs in bits or bytes per second, characters per second, CD ROM or DVD ROM speeds (usually denoted as 1X, 2X, 3X, and so on up to maximum levels. The speed of data over the internet is calculated based on the Ethernet speeds. This is the instance where the device determines the speed. The input is also accepted in the standard bits or bytes per second and the outputs are given in one of the many units as required.
The density of an object, also known as volumetric mass density is its mass per unit volume. Mathematically, density is mass divided by volume. In common terms, density is usually called as weight per unit volume which is scientifically inaccurate but more common in practice. Adding other confused terms like specific gravity and relative density mean that calculating density can become confusing. Which is why it is essential to depend on a tool that is used to convert density unit.
Digital storage and digital image resolution
The digital world is defined by bits and bytes, so it is natural that the unit for data storage is a variation or multiple of bits and bytes. A byte is eight bits of data, and digital storage is calculated with that as the basest unit. But the larger the requirement, the larger the unit.
Digital image resolution is the technical unit to measure how clear a particular digital image is. Images are usually represented based on pixels of the screen and can be calculated by how many dots of image can occupy a particular unit of space on a screen. This means that the screen size is measured in the normal units, including millimeters and inches, and the image resolution is calculated as dots per inch or pixels per inch.