Today I Learn

2021-02-13 06:54:43 ​​How are people able to breathe inside a submarine?

The air we breathe is made up of significant quantities of four gases. When we breathe in air, our bodies consume its oxygen and convert it to carbon dioxide. Exhaled air contains about 4.5-percent carbon dioxide. Our bodies do not do anything with nitrogen or argon. A Submarine
is a sealed container that contains people and a limited supply of air.

Oxygen is supplied either from pressurized tanks, an oxygen generator (which can form oxygen from the electrolysis of water or by some other means) or some sort of "oxygen canister" (You may remember these canisters because of their problems on the MIR Space Station they release oxygen by a very hot chemical reaction). Oxygen is either released continuously by a computerized system that senses the percentage of oxygen in the air, or it is released in batches periodically through the day.
Carbon dioxide can be removed from the air chemically using soda lime (sodium hydroxide and calcium hydroxide). The carbon dioxide is trapped in the soda lime by a chemical reaction and removed from the air. Other similar reactions can accomplish the same goal.
The moisture can be removed by a dehumidifier chemically. This prevents it from condensing on the walls and equipment inside the ship.

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2021-02-13 06:54:41 Open / Comment

2021-02-11 04:02:28 United Nations Security Council

The United Nations Security Council is one of the six principal organs of the United Nations, charged with ensuring international peace and security, recommending the admission of new UN members to the General Assembly, and approving any changes to the UN Charter.

Its powers include establishing peacekeeping operations, enacting international sanctions, and authorizing military action. The UNSC is the only UN body with the authority to issue binding resolutions on member states.

Headquarters: New York, United States

Founded: 24 October 1945

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2021-02-11 04:00:52 ​​What Is an IQ Test?

An IQ test is an assessment that measures a range of cognitive abilities and provides a score that is intended to serve as a measure of an individual's intellectual abilities and potential. IQ tests are among the most commonly administered psychological tests. In order to understand what these scores really mean, it is essential to look at exactly how these test scores are calculated. Today, many tests are standardized and scores are derived by comparing individual performance against the norms for the individual's age group.

Historically, IQ tests have been scored in one of two ways. In the first method, a person's mental age was divided by their chronological age and then multiplied by 100. The other methods involve comparing scores against the scores of others in the individual's same age group. Many different tests are in use today including the afore mentioned Stanford-Binet and the Wechsler Adult Intelligence Scale, as well as the Woodcock-Johnson Tests of Cognitive Abilities. Each individual test is different in terms of exactly what is being measured, how it is scored, and how these scores are interpreted.

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