Octane numbers measure a fuel’s resistance to detonation, with two primary rating systems (RON and MON) and a third average (AKI). Iso-octane is used as a benchmark, and higher compression engines require anti-knock fuel. Octane ratings do not indicate energy capacity, and high octane can refer to high compression, not necessarily more power. An octane […]
The acid number measures the acidity of oils like petroleum and cooking oil by calculating the mass of potassium hydroxide needed to neutralize the acids in one gram of oil. The acid number test uses acid-base chemistry principles to determine acidity, with acids emitting hydrogen ions and bases emitting hydroxide ions. The amount of base […]
Atoms form ionic bonds by giving or accepting electrons and covalent bonds by sharing electrons. Oxidation numbers represent electron sharing, loss, or gain. Oxygen is a strong oxidizing agent, but other elements can also oxidize. Elements have different oxidation numbers, and ions have an overall oxidation number. Atoms combine by giving and accepting negatively charged […]
Cetane number measures diesel fuel’s combustible qualities on a scale of 0-100, with higher numbers indicating better quality. Cetane is one of many hydrocarbons in diesel fuel, but it ignites more easily, making it the standard for flammability. Low cetane numbers can cause engine problems, while high numbers improve efficiency and horsepower. Most diesel engines […]
A financial institution number identifies a bank or financial institution during interbank transactions. It’s part of the routing transit number and helps simplify processing transactions between banks. The number’s length and location vary by country, and it’s important to include it when paying bills online or writing paper checks. A financial institution number is a […]
A payroll number is assigned to employees for payroll reports and is used to calculate wages. It is usually a three to eight digit code found on payslips and other employee-related documents. Payroll software requires the number to track and pay salaries. The history of payroll systems dates back to 4000 BC and was initially […]
A Purchase Order (PO) number is a code used by businesses to track purchases, and some companies provide PO numbers to customers to track orders. The format varies, but it often includes alphanumeric characters indicating information about the order. PO numbers are used to verify orders, apply costs to budgets, and make payments to sellers. […]
Wire transfers are electronic transfers of funds between individuals through financial institutions, often used for bill payments. Routing numbers identify the financial agency involved, and fees are charged by both sending and receiving institutions. Retail wire transfer companies charge fees and processing times vary. A wire transfer is an electronic transfer of funds between individuals […]
Triskaidekaphobia, the fear of the number 13, has historical and mythological roots. It can stem from anxiety or depression and can be treated with professional help. Some people form clubs to debunk the fear. Fear of the number 13 is common enough to have its own phobia named after it. This is not to say, […]
A Global Location Number (GLN) is a 13-digit code used to provide location information for physical objects and entities such as personal or bank accounts. It is part of international standards established by GS1 to make it easier for companies to do business globally. GLNs can be used for tracking products, identifying specific offices or […]
A bank identification number (BIN) is a numerical code used to identify the bank or financial institution responsible for approving and completing transactions. It is used for credit and debit card purchases, fund transfers, and offers some protection against identity theft. The standard BIN length is six digits, but some institutions use four digits. Also […]
Transit routing numbers are used by US banking institutions to identify themselves on paper checks and electronic transactions. They are necessary for online bill payments, direct deposits, and automatic withdrawals. The American Bankers Association issues these numbers, with more than 25,000 in use. Customers can find their transit routing number on their paper checks or […]
Coordination numbers indicate the number of bonds a central metal ion has in a compound, ranging from 2 to 16. Transition metals are commonly used and ligands determine the coordination number. Compounds with coordination numbers can be referred to by the number or a geometric name. Defined by Alfred Werner in 1893, a coordination number […]
Blocking phone numbers is easy thanks to improved technology. The National Do Not Call Registry can stop telemarketing calls, and private individuals can be blocked with call screening or blocking services. Mobile phones can use caller ID, and numbers can be hidden by dialing *67. Selective blocking is possible with *60, but may come with […]
A tax identification number is a numerical designation assigned to a business entity to identify it for tax purposes. It is required in many countries before a company can operate and can be revoked if the business is not operating within the necessary legal perimeters. Often referred to as a tax identification number, a tax […]
The Nusselt number is a unitless comparison rate for heat transfer between materials with convection or conduction. It can be used for fluids or solids per gas flow. The equation is Nu = hL/λ. A Nusselt correlation close to one indicates laminar flow, while values between 100 and 1000 indicate convection as the dominant form […]
DUNS numbers are unique identifiers assigned to companies registered with Dun & Bradstreet, used to verify credit and financial history. The Data Universal Numbering System (DUNS) was created in 1963 to eliminate problems caused by using a company’s name as its identifier. Dun & Bradstreet reports can be used by banks, creditors, grantmakers, and clients […]
A file number is a unique code assigned to a legal case by the court clerk, which tracks the case as it moves through the courts. The number incorporates case information and is used to identify and retrieve case-related materials. A file number is a unique identification code used for a legal case. When the […]
A trademark number is assigned by the USPTO to pending or registered trademarks, and can be used to search the database for information. TESS is used for searches, and a filing receipt with a serial number is given to applicants. The number must be used for correspondence and checking status. A trademark number is the […]
Parents can teach number recognition to children before kindergarten through hands-on activities that turn lessons into games. These include using modeling clay, file folder games, physical activity, and art projects. Learning numbers prepares children for future math concepts. Parents can teach a child number recognition before they even enter kindergarten using several hands-on activities. The […]
