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  2. Calcium carbonate - Wikipedia

    en.wikipedia.org/wiki/Calcium_carbonate

    For [CO 2] = 1.2 × 10 −5, it results in [H 2 CO 3] = 2.0 × 10 −8 moles per liter. When [H 2 CO 3 ] is known, the remaining three equations together with Calcium ion solubility as a function of CO 2 partial pressure at 25 °C ( K sp = 4.47 × 10 −9 )

  3. Xi Jinping - Wikipedia

    en.wikipedia.org/wiki/Xi_Jinping

    [10] [11] In 1963, when he was aged 10, his father was purged from the CCP and sent to work in a factory in Luoyang, Henan. [12] In May 1966, the Cultural Revolution cut short Xi's secondary education when all secondary classes were halted for students to criticise and fight their teachers. Student militants ransacked the Xi family home and one ...

  4. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    By analogy to electronic transitions, muonic atom transitions are also said to produce X-rays, even though their energy may exceed 6 megaelectronvolts (0.96 pJ), [9] whereas there are many (77 known to be less than 10 keV (1.6 fJ)) low-energy nuclear transitions (e.g., the 7.6 eV (1.22 aJ) nuclear transition of thorium-229m), and, despite being ...

  5. History of Australian currency - Wikipedia

    en.wikipedia.org/wiki/History_of_Australian_currency

    Like the pound sterling, the Australian pound was divided into 20 shillings and each shilling was divided into 12 pence, making a pound worth 240 pence. The Act also prohibited the circulation of all State notes and demonetised them, [10] giving full control over the issue of Australian notes to the Commonwealth Treasury.

  6. Fentanyl - Wikipedia

    en.wikipedia.org/wiki/Fentanyl

    Fentanyl is a highly potent synthetic piperidine opioid primarily used as an analgesic.It is 20 to 40 times more potent than heroin and 100 times more potent than morphine; [8] its primary clinical utility is in pain management for cancer patients and those recovering from painful surgeries.

  7. Telegram (software) - Wikipedia

    en.wikipedia.org/wiki/Telegram_(software)

    Telegram clients have the ability to turn off media autoplay and automatic downloads for both WiFi and mobile data, adjusting them for media type and size. Auto download settings can also be applied based on chat type such as group, channel or private.

  8. QF 18-pounder gun - Wikipedia

    en.wikipedia.org/wiki/QF_18-pounder_gun

    The Ordnance QF 18-pounder, [note 3] or simply 18-pounder gun, was the standard British Empire field gun of the First World War-era.It formed the backbone of the Royal Field Artillery during the war, and was produced in large numbers.

  9. Crack growth equation - Wikipedia

    en.wikipedia.org/wiki/Crack_growth_equation

    Figure 1: Typical plot of crack growth rate versus the stress intensity range. The Paris–Erdogan equation fits the central linear region of Regime B. A crack growth equation is used for calculating the size of a fatigue crack growing from cyclic loads. The growth of a fatigue crack can result in catastrophic failure, particularly in the case ...

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