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Foams are two-phase material systems where a gas is dispersed in a second, non-gaseous material, specifically, in which gas cells are enclosed by a distinct liquid or solid material.^{: 6 : 4} The foam "may contain more or less liquid [or solid] according to circumstances",^: 6 although in the case of gas-liquid foams, the gas occupies most of the volume.^: 4 The word derives from the medieval German and otherwise obsolete veim, in reference to the "frothy head forming in the glass once the beer has been freshly poured" (cf. ausgefeimt).^: 1

Theories regarding foam formation, structure, and properties—in physics and physical chemistry—differ somewhat between liquid and solid foams in that the former are dynamic (e.g., in their being "continuously deformed"), as a result of gas diffusing between cells, liquid draining from the foam into a bulk liquid, etc.^: 1–2 Theories regarding liquid foams have as direct analogs theories regarding emulsions,^: 3 two-phase material systems in which one liquid is enclosed by another.

In most foams, the volume of gas is large, with thin films of liquid or solid separating the regions of gas. A bath sponge and the head on a glass of beer are examples of foams; soap foams are also known as suds.

Solid foams can be closed-cell or open-cell. In closed-cell foam, the gas forms discrete pockets, each completely surrounded by the solid material. In open-cell foam, gas pockets connect to each other. A bath sponge is an example of an open-cell foam: water easily flows through the entire structure, displacing the air. A sleeping mat is an example of a product composed of closed-cell foam.

Foams are examples of dispersed media. In general, gas is present, so it divides into gas bubbles of different sizes (i.e., the material is polydisperse)—separated by liquid regions that may form films, thinner and thinner when the liquid phase drains out of the system films. When the principal scale is small, i.e., for a very fine foam, this dispersed medium can be considered a type of colloid.

Foam can also refer to something that is analogous to foam, such as quantum foam.

King is the title given to a male monarch in a variety of contexts. A king is an absolute monarch if he holds the powers of government without control, or the entire sovereignty over a nation; he is a limited monarch if his power is restrained by fixed laws; and he is an absolute, when he holds the whole legislative, judicial, and executive power, or when the legislative or judicial powers, or both, are vested in other people by the king. Kings are hereditary sovereigns when they hold the powers of government by right of birth or inheritance, and elective when raised to the throne by choice.

• In the context of prehistory, antiquity and contemporary indigenous peoples, the title may refer to tribal kingship. Germanic kingship is cognate with Indo-European traditions of tribal rulership (c.f. Indic rājan, Gothic reiks, and Old Irish rí, etc.).
• In the context of classical antiquity, king may translate in Latin as rex and in Greek as archon or basileus.
• In classical European feudalism, the title of king as the ruler of a kingdom is understood to be the highest rank in the feudal order, potentially subject, at least nominally, only to an emperor (harking back to the client kings of the Roman Republic and Roman Empire).
• In a modern context, the title may refer to the ruler of one of a number of modern monarchies (either absolute or constitutional). The title of king is used alongside other titles for monarchs: in the West, emperor, grand prince, prince, archduke, duke or grand duke, and in the Islamic world, malik, sultan, emir or hakim, etc.
• The city-states of the Aztec Empire each had a tlatoani. These were the kings of pre-Hispanic Mesoamerica. The Huey Tlatoani was the emperor of the Aztecs.

The term king may also refer to a king consort, a title that is sometimes given to the husband of a queen regnant, but the title of prince consort is more common.

A mattress is a large, usually rectangular pad for supporting a person lying down, especially for sleeping. It is designed to be used as a bed, or on a bed frame as part of a bed. Mattresses may consist of a quilted or similarly fastened case, usually of heavy cloth, containing materials such as hair, straw, cotton, foam rubber, or a framework of metal springs. Mattresses may also be filled with air or water.

Mattresses are usually placed on top of a bed base which may be solid, as in the case of a platform bed, or elastic, such as an upholstered wood and wire box spring or a slatted foundation. Popular in Europe, a divan incorporates both mattress and foundation in a single upholstered, footed unit. Divans have at least one innerspring layer as well as cushioning materials. They may be supplied with a secondary mattress or a removable "topper". Mattresses may also be filled with air or water, or a variety of natural fibers, such as in futons. Kapok is a common mattress material in Southeast Asia, and coir in South Asia.

Simba is a fictional character and the main protagonist of Disney's The Lion King franchise. First appearing as a lion cub in The Lion King (1994), the character flees his homeland when his father, King Mufasa, is killed by his treacherous uncle, Scar. Several years later, Simba returns home as an adult to reconcile his childhood trauma, confront Scar, and reclaim his rightful place as King of the Pride Lands. He subsequently appears in sequels The Lion King II: Simba's Pride and The Lion King 1½. Simba was originally voiced by actors Matthew Broderick and Jonathan Taylor Thomas as an adult and cub, respectively; various actors have voiced the character in sequels, spin-offs, and related media.

Created by screenwriters Irene Mecchi, Jonathan Roberts, and Linda Woolverton, Simba underwent several changes as the film's story was revised, including making him a more sympathetic character, and notably establishing his familial relation to Scar. Although conceived as an original character, Simba was inspired by Moses and Joseph from the Bible, and Prince Hamlet from William Shakespeare's Hamlet. Despite sharing several similarities with the title character from the anime television series Kimba the White Lion, Disney claims Simba was not inspired by Kimba. Mark Henn and Ruben A. Aquino were supervising animators for the cub and adult Simba, respectively, with both animators researching live lions and drawing inspiration from the character's voice actors.

Simba has received a mixed reception from film critics, some of whom praised his design but found him uninteresting as a main character. However, several publications have ranked Simba among Disney's most iconic characters, and consider him to be one of the most famous lions in popular culture. The character's likeness has been used in several tie-in products, including merchandise, television series, and video games. In 1997, The Lion King actors Scott Irby-Ranniar and Jason Raize originated the role on Broadway. In 2019, Donald Glover and JD McCrary voiced the character in a photorealistic remake of the film.

Size in general is the magnitude or dimensions of a thing. More specifically, geometrical size (or spatial size) can refer to three geometrical measures: length, area, or volume. Length can be generalized to other linear dimensions (width, height, diameter, perimeter). Size can also be measured in terms of mass, especially when assuming a density range.

In mathematical terms, "size is a concept abstracted from the process of measuring by comparing a longer to a shorter". Size is determined by the process of comparing or measuring objects, which results in the determination of the magnitude of a quantity, such as length or mass, relative to a unit of measurement. Such a magnitude is usually expressed as a numerical value of units on a previously established spatial scale, such as meters or inches.

The sizes with which humans tend to be most familiar are body dimensions (measures of anthropometry), which include measures such as human height and human body weight. These measures can, in the aggregate, allow the generation of commercially useful distributions of products that accommodate expected body sizes, as with the creation of clothing sizes and shoe sizes, and with the standardization of door frame dimensions, ceiling heights, and bed sizes. The human experience of size can lead to a psychological tendency towards size bias, wherein the relative importance or perceived complexity of organisms and other objects is judged based on their size relative to humans, and particularly whether this size makes them easy to observe without aid.