PO is the abbreviation of post office, and the PO plus sign refers to the order number of goods. To indicate the purchase order number on the order is to write down the order number on the order. In addition to the sequence number, there are the following meanings, which should be distinguished.

The order number is the order number obtained after shopping on the shopping website, which records the purchase order information. Generally, it consists of 14 digits. It should be noted that when you need to make an order inquiry to the shopping website, you need to provide the merchant order number to the shopping website.

In addition to the serial number, the following o is also a symbol of chemical elements if it is lowercase, so be careful not to confuse it with the serial number when you meet it. When sending express delivery, some PO will be directly written as the order number, so it is rare to use the abbreviation PO in life.

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Polonium (Po):

Polonium is the most poisonous substance in the world. The toxicity of polonium 2 10 is higher than that of cyanide10 billion times. It is easy to form radioactive aerosol through nuclear recoil, pollute the environment and air, and even enter the human body through the skin, so it must be sealed and preserved. According to the regulations of the US Nuclear Regulatory Commission, the maximum intake of polonium -2 10 is 0.8g per trillion. You know polonium is also an expensive metal.

The isotope plutonium -239 is the most important fission component in nuclear weapons. The production of several tons of weapons-grade plutonium-239 needs to be priced at 10 billion dollars. Polonium has three isotopes, all of which are radioactive. The most common and easily obtained polonium isotope is polonium 2 10, with a half-life of only 134 days, which is nearly 5000 times more radioactive than radium. Polonium -2 10 is very dangerous, so even a small amount should be paid attention to during operation.

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