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It is an environmental KPI parameter in paper making. Acidic paper made from wood-based pulp that still contains lignin will deteriorate over time by becoming brittle and turning yellow. [1] For document preservation, acid-free papers are therefore gaining popularity and have pH of 7 or slightly higher.
Snow can be made in the chamber. [4] The Temperature-Altitude Chamber is 13.5 feet (4.1 m) by 9.5 feet (2.9 m) with a height of 6.9 feet (2.1 m). Altitudes up to 80,000 feet (24 km) can be simulated. The temperature range is −80 °F (−62 °C) to 140 °F (60 °C). [4] The engine test cell was originally used for aircraft engines.
The test is conducted in an Erlenmeyer flask, or in a separatory funnel. It involves the combustion of a sample in pure oxygen, followed by the absorption of the combustion products by a solution of sodium hydroxide. [2] It allows quantitative determination of elemental chlorine, nitrogen and sulfur in a sample.
Parallel to the degradation under the influence of water, the cellulose chains react with oxygen, also cutting the chains. [5] The lignin in the paper is also oxidized, which yellows the paper. The gradual and eventually complete deterioration of the paper as the cellulose chains disintegrate is known as "slow fire".
BOD Bottle BOD test bottles at the laboratory of a wastewater treatment plant. BOD Bottle or an incubation bottle is a main apparatus used for the Biological Oxygen Demand (BOD) test. During the five-day BOD or BOD5 test process, the BOD bottle is used for incubating diluted samples under the 20 °C or 68 °F of temperature.
For the first time in two decades, the Food and Drug Administration (FDA) has approved a new class of medication that provides an alternative to addictive opioids for patients looking to manage ...
An Orsat gas analyser or Orsat apparatus is a piece of laboratory equipment used to analyse a gas sample (typically fossil fuel flue gas) for its oxygen, carbon monoxide and carbon dioxide content. Although largely replaced by instrumental techniques, the Orsat remains a reliable method of measurement and is relatively simple to use. [1]
The discovery, they say, may be the most significant in a series of archaeological finds made at the mouth of the Miami River in the past 25 years that include the Miami Circle National Historic ...