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  2. High availability - Wikipedia

    en.wikipedia.org/wiki/High_availability

    Another memory trick to calculate the allowed downtime duration for an "-nines" availability percentage is to use the formula seconds per day. For example, 90% ("one nine") yields the exponent 4 − 1 = 3 {\displaystyle 4-1=3} , and therefore the allowed downtime is 8.64 × 10 3 {\displaystyle 8.64\times 10^{3}} seconds per day.

  3. Uptime - Wikipedia

    en.wikipedia.org/wiki/Uptime

    Uptime is a measure of system reliability, expressed as the period of time a machine, typically a computer, has been continuously working and available.Uptime is the opposite of downtime.

  4. Copper in heat exchangers - Wikipedia

    en.wikipedia.org/wiki/Copper_in_heat_exchangers

    Today, steam, evaporator, and condenser coils are made from copper and copper alloys. [3] These heat exchangers are used in air conditioning and refrigeration systems, industrial and central heating and cooling systems, radiators , hot water tanks , and under-floor heating systems.

  5. Apollo program - Wikipedia

    en.wikipedia.org/wiki/Apollo_program

    The Apollo program, also known as Project Apollo, was the United States human spaceflight program led by NASA, which succeeded in landing the first men [2] on the Moon in 1969, following Project Mercury, which put the first Americans in space.

  6. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Iron is a chemical element with symbol Fe and atomic number 26, essential for human life and widely used in various industries.

  7. Microwave transmission - Wikipedia

    en.wikipedia.org/wiki/Microwave_transmission

    The atmospheric attenuation of microwaves in dry air with a precipitable water vapor level of 0.001 mm. The downward spikes in the graph corresponds to frequencies at which microwaves are absorbed more strongly, such as by oxygen molecules.

  8. Anthony Eden - Wikipedia

    en.wikipedia.org/wiki/Anthony_Eden

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