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Data compression ratio, also known as compression power, is a measurement of the relative reduction in size of data representation produced by a data compression algorithm. It is typically expressed as the division of uncompressed size by compressed size.
For example, figures may be biased as follows: if one classroom has a 30:1 ratio and another has a 10:1 ratio, the school could thus claim to have a 20:1 ratio overall. In schools, such ratios are indicative of possible staff changes. If the student–teacher ratio is 50:1, the school will probably consider hiring more teachers.
For example, the ratio 4:5 can be written as 1:1.25 (dividing both sides by 4) Alternatively, it can be written as 0.8:1 (dividing both sides by 5). Where the context makes the meaning clear, a ratio in this form is sometimes written without the 1 and the ratio symbol (:), though, mathematically, this makes it a factor or multiplier.
This format is still used in many personal video cameras today and has influenced the selection or design of other aspect ratios. It is the standard Super 35 mm ratio. 1.37:1 ~ 48:35 16 mm and 35 mm standard ratio. 1.375:1 = 11:8 35 mm full-screen sound film image, nearly universal in films between 1932 and 1953.
A turbine meter has a turndown ratio of 10:1. Rotary positive displacement meters have a turndown ratio of between 10:1 and 80:1, depending on the manufacturer and the application. Diaphragm meters are considered to have a turndown ratio of 80:1. Multipath ultrasonic meters often have a stated turndown ratio of 50:1.
In the United Kingdom, a Rate Adaptive Digital Subscriber Line connection used to be marketed with a contention ratio between 20:1 and 50:1 within the British Telecom network, meaning that 20 to 50 subscribers, each assigned or sold a bandwidth of up to 8 Mbit/s for instance, may be sharing 8 Mbit/s of downlink bandwidth.
If we assume a 50% operating margin for Tesla on the ride-sharing network, it would earn $80 billion in operating income on top of the $7.1 billion the business earned last year.
For example, if the static compression ratio is 10:1, and the dynamic compression ratio is 7.5:1, a useful value for cylinder pressure would be 7.5 1.3 × atmospheric pressure, or 13.7 bar (relative to atmospheric pressure). The two corrections for dynamic compression ratio affect cylinder pressure in opposite directions, but not in equal strength.