Cold inflation pressure

Cold inflation pressure is the inflation pressure of tires before the car is driven and the tires warmed up. Recommended cold inflation pressure is displayed on the owner's manual and on the placard (or sticker) attached to the vehicle door edge, pillar, glovebox door or fuel filler flap. Drivers are encouraged to make sure their tires are adequately inflated, as suboptimal tire pressure can greatly reduce fuel economy, increase emissions, increased wear on the edges of the tire surface, and can lead to premature failure of the tire. Excessive pressure, on the other hand, will lead to blowouts, decrease braking performance, and cause uneven wear (i.e. greater wear on the inner part of the tire surface).

Tire pressure is commonly measured in psi in the imperial and US customary systems, bar, which is deprecated but accepted for use with SI or the kilopascal (kPa), which is an SI unit.

Ambient temperature affects the cold tire pressure. Absolute cold tire pressure (gauge pressure plus atmospheric pressure) varies directly with the absolute temperature, measured in kelvins.

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Bar

A bar (also known as a saloon or a tavern or sometimes a pub or club, referring to the actual establishment, as in pub bar or club bar etc.) is a retail business establishment that serves alcoholic beverages, such as beer, wine, liquor, cocktails, and other beverages like mineral water and soft drinks and often sell snack foods, like crisps or peanuts, for consumption on premises. Some types of bars, such as pubs, may also serve food from a restaurant menu.

Bars provide stools or chairs that are placed at tables or counters for their patrons. Some bars have entertainment such as a live band, Bars that offer entertainment or live music are often referred to as music bars, live venues, or nightclubs. Types of bars range from inexpensive dive bars to elegant places of entertainment often accompanying restaurants for dining.

Many bars have a discount period, designated a "happy hour" to encourage off-peak-time patronage. Bars that fill to capacity sometimes implement a cover charge or a minimum drink purchase requirement during their peak hours. Bars may have bouncers to ensure patrons are of legal age, to eject drunk or fighting patrons, and to collect cover charges. Such bars often feature entertainment, which may be a live band, vocalist, comedian, or disc jockey playing recorded music.

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Pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure.

Various units are used to express pressure. Some of these derive from a unit of force divided by a unit of area; the SI unit of pressure, the pascal (Pa), for example, is one newton per square metre; similarly, the pound-force per square inch (psi) is the traditional unit of pressure in the imperial and US customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (atm) is equal to this pressure and the torr is defined as ¹⁄₇₆₀ of this. Manometric units such as the centimetre of water, millimetre of mercury and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.

Definition

Pressure is the amount of force acting per unit area. The symbol for pressure is p or P. The IUPAC recommendation for pressure is a lower-case p. However, upper-case P is widely used. The usage of P vs p depends on the field in which one is working, on the nearby presence of other symbols for quantities such as power and momentum, and on writing style.