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  2. State of matter - Wikipedia

    en.wikipedia.org/wiki/State_of_matter

    The term phase is sometimes used as a synonym for state of matter, but it is possible for a single compound to form different phases that are in the same state of matter. For example, ice is the solid state of water, but there are multiple phases of ice with different crystal structures, which are formed at different pressures and temperatures.

  3. List of states of matter - Wikipedia

    en.wikipedia.org/wiki/List_of_states_of_matter

    Matter organizes into various phases or states of matter depending on its constituents and external factors like pressure and temperature. Except at extreme temperatures and pressures, atoms form the three classical states of matter: solid , liquid and gas .

  4. Package tracking - Wikipedia

    en.wikipedia.org/wiki/Package_tracking

    Tracking packages with stationary bar code reader in a warehouse sorting operation. Package tracking or package logging is the process of localizing shipping containers, mail and parcel post at different points of time during sorting, warehousing, and package delivery to verify their provenance and to predict and aid delivery.

  5. Intelligent Mail barcode - Wikipedia

    en.wikipedia.org/wiki/Intelligent_Mail_barcode

    This section of the code may be omitted, but if it is present, the 5-, 9-, or 11-digit forms of the ZIP Code are also encoded in the Intelligent Mail barcode. The full 11-digit form includes the standard 5-digit ZIP code, the ZIP + 4 code, and a 2-digit code indicating the exact delivery point. This is the same information that was encoded in ...

  6. Mail Isolation Control and Tracking - Wikipedia

    en.wikipedia.org/wiki/Mail_Isolation_Control_and...

    The Postmaster General has stated that the system is primarily used for mail sorting, [2] though it also enables the USPS to retroactively track mail correspondence at the request of law enforcement. [2] It was created in the aftermath of the 2001 anthrax attacks that killed five people, including two postal workers.

  7. United States Postal Service - Wikipedia

    en.wikipedia.org/wiki/United_States_Postal_Service

    The full eagle logo, used in various versions from 1970 to 1993. The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or simply the Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, its insular areas and associated states.

  8. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    The three common states of matter. Along with oxidane, water is one of the two official names for the chemical compound H 2 O; [50] it is also the liquid phase of H 2 O. [51] The other two common states of matter of water are the solid phase, ice, and the gaseous phase, water vapor or steam.

  9. Informed Delivery - Wikipedia

    en.wikipedia.org/wiki/Informed_Delivery

    Some mailpieces (e.g., catalogues, magazines, larger envelopes) are not imaged by USPS automated equipment and do not appear in Informed Delivery notifications. Users can also receive USPS Tracking updates for incoming packages, provide delivery instructions, manage notifications, and schedule redelivery directly from Informed Delivery.