Mug

A mug is a specific type of drinking vessel designed for various liquids. While often used for hot beverages like tea, coffee, or hot chocolate, they are also used for cold drinks.

A mug is distinguished from a traditional cup by its handle and its capacity. Most mugs hold approximately 350 milliliters of liquid, which is larger than a standard teacup.

A single vertical handle is an essential feature. Without this handle, the vessel is considered a beaker. Unlike teacups, mugs are typically used in informal settings rather than formal place settings.

Designers focus heavily on thermal insulation when creating mugs. To keep drinks hot, mugs often feature thick walls. These thick walls prevent the liquid from cooling too quickly.

The handle also plays a vital role in heat management. Its small cross-section reduces heat flow from the liquid to the hand. This allows the user to hold the vessel without being burned. Many mugs also feature a concave bottom or an extra rim. This design reduces thermal contact with the surface where the mug sits. This feature can sometimes leave a characteristic circular stain on a table.

There are many specialized subtypes of mugs used for different purposes. Travel mugs were introduced in the 1980s to help people transport liquids.

These are often well-insulated and feature a cover to prevent spills. A lid is vital because evaporation is the primary way hot beverages lose heat.

Auto mugs, or commuter mugs, are designed specifically for driving. These often have a narrower base to fit into vehicle cup-holders. They may also lack handles to make them easier to grab while driving.

Other specialized types include beer steins, which are stoneware mugs from Germany.

Tiki mugs are sculptural vessels depicting imagery from Polynesia or Melanesia.

History shows that mugs have evolved alongside human technology. Early mugs were likely carved from wood, though few have survived.

The invention of the potter's wheel between 6,500 and 3,000 BCE allowed for easier pottery production. By 4,000 to 5,000 BCE, decorated clay mugs were being used in Greece.

Metal mugs made of bronze, silver, or gold appeared around 2,000 BCE. However, these were difficult to use for very hot drinks. The invention of porcelain in China around 600 CE was a major turning point.

Porcelain allowed for thin-walled mugs that worked well for both hot and cold liquids. The earliest recorded use of the word "mug" for its current meaning was in 1664.

During World War II, the United States Navy required a specific type of mug. They needed a vessel that could survive the rough conditions on ships.

The company Victor Insulators developed a white-glazed, thick-walled mug without a handle. Because it was made from the same porcelain used for high-voltage insulators, it had excellent insulation. After the war, Victor created a commercial version with a handle and tapered body.

This design was widely imitated by other manufacturers. Victor eventually stopped production in the early 1990s due to competition from cheaper imports. Today, original Victor mugs are highly sought after by collectors.

Some mugs are designed for entertainment or as puzzles. An amusement mug, known as a whistle mug, has a hollow handle. When the mug is filled, it produces melodious trills and warbling sounds.

Surprise mugs were popular in the 18th and 19th centuries as practical jokes. These contained a small ceramic creature, like a frog, at the bottom.

Puzzle mugs use tricks to prevent normal drinking. For example, a Pythagorean cup uses a hidden siphon. If the liquid is filled above a certain height, the siphon drains all the liquid through a hole in the base.

Fuddling cups consist of three connected mugs that must be emptied in a specific sequence.

Decoration is a significant aspect of modern mug culture. Many mugs serve as objects of art or advertisements.

One popular method is thermochromism, used in "magic mugs." These change color when a hot beverage is poured inside.

Permanent decorations are often applied using silk screen printing or decals. A ceramic powder mixed with dyes is printed onto paper. This paper is then applied to the mug and fired in a kiln. The heat softens the glaze and embeds the image permanently.

To keep collections organized, people often use a "mug tree." This is a pole with pegs used to hang mugs by their handles.