OD

OD or Od may refer to:

Medicine

Music

Computing

Travel

Other uses

Google Play

Google Play or Google Play Store, and originally the Android Market, is a digital distribution platform operated by Google. It serves as the official app store for the Android operating system, allowing users to browse and download applications developed with the Android SDK and published through Google. Google Play also serves as a digital media store, offering music, magazines, books, movies, and television programs. It previously offered Google hardware devices for purchase until the introduction of a separate online hardware retailer, Google Store, on March 11, 2015.

Applications are available through Google Play either free of charge or at a cost. They can be downloaded directly to an Android or Google TV device through the Play Store mobile app, or by deploying the application to a device from the Google Play website. Many applications can be targeted to specific users based on a particular hardware attribute of their device, such as a motion sensor (for motion-dependent games) or a front-facing camera (for online video calling).

Thermal expansion

Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature, through heat transfer.

Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin moving more and usually maintain a greater average separation. Materials which contract with increasing temperature are unusual; this effect is limited in size, and only occurs within limited temperature ranges (see examples below). The degree of expansion divided by the change in temperature is called the material's coefficient of thermal expansion and generally varies with temperature.

Overview

Predicting expansion

If an equation of state is available, it can be used to predict the values of the thermal expansion at all the required temperatures and pressures, along with many other state functions.

Contraction effects (negative thermal expansion)

Laws of Australian rules football

The laws of Australian rules football describe the rules of the game of Australian rules football as they have evolved and adapted, with the same underlying core rules, since 1859.

The current laws consist of an extensive document titled "Laws of Australian Football", which contains the rules and interpretations of the game, and is managed and administered by the Australian Football League.

The rules were first formed by the Melbourne Football Club, chaired by Tom Wills in 1859. The laws significantly predate the advent of a governing body for the sport. The first national and international body, the Australasian Football Council, was formed in 1905 to govern Australian Football. Since 1994, the rules for the game known as Australian football have been governed by the AFL and the organisation's Laws of the Game committee.

Players, ground and equipment

18 players are permitted to take the field for each team, with an additional four players on an interchange bench (although this number often varies in exhibition and practice matches). The equipment needed to play the game is minimal. As in other kinds of football, players wear boots with stops (known as "cleats" or "studs" in some regions) in the soles, shorts, and a thick, strong shirt or jumper known as a guernsey, normally sleeveless, although long sleeve jumpers are sometimes worn in very cold weather by some players.