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Orifice plate showing vena contracta. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. When a fluid (whether liquid or gaseous) passes through the orifice, its pressure builds up slightly upstream of the orifice [1] but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases.
With the Revised Motor Vehicle Law (Act No. 3992) introduced in 1933, second-generation Philippine license plates were introduced; they can be in the format of "A-B" or "P-B", where A is an area code number (used until 1960), P is a vehicle classification prefix, and B is a 3 to 6-digit number.
A restrictive flow orifice (RFO) is a type of orifice plate.They are used to limit the potential danger, damage, or wastage of an uncontrolled flow from, for example, a compressed gas cylinder [1] [2] They are generally not limiting the flow during normal operation but if a fault or failure occurs causing uncontrolled flow the orifice will present a restriction, limiting the flow.
An orifice is any opening, mouth, hole or vent, as in a pipe, a plate, or a body Body orifice, any opening in the body of a human or animal; Orifice plate, a restriction used to measure flow or to control pressure or flow, sometimes given specialised names: Calibrated orifice, used to control pressure or flow
This is a timeline of Philippine history, comprising important legal and territorial changes and political events in the Philippines and its predecessor states. To read about the background to these events, see history of the Philippines .
Historically documented states/polities (north to south) Pangasinan (historical polity) Caboloan; Cainta; Tondo; Namayan; Maynila; Kumintang; Ibalon; Ma-i; Pulilu
In November 2021 the LTO have already released new red plates for government vehicles registered from 2016 to 2019. In 2024, the LTO released the new series of red plates for government vehicles which indicate the second letter as the region where they were registered (e.g. SNA for Metro Manila; SDA for Calabarzon).
The economic history of the Philippines is shaped by its colonial past, evolving governance, and integration into the global economy. Prior to Spanish colonization in the 16th century, the islands had a flourishing economy centered around agriculture, fisheries, and trade with neighboring countries like China, Japan, and Southeast Asia.