A health savings account (HSA) is a tax-advantaged medical savings account available to taxpayers in the United States who are enrolled in a high-deductible health plan (HDHP). The funds contributed to an account are not subject to federal income tax at the time of deposit. health savings account (HSA) is a tax-advantaged medical savings account available to taxpayers in the United States who are enrolled in a high-deductible health plan (HDHP). The funds contributed to an account are not subject to federal income tax at the time of deposit.
Hans Christian Oersted, a Danish chemist, was the first to produce tiny amounts of aluminum in 1825, German chemist Friedrich WÃ¶hler developed a method that produced enough to study the metal's basic properties in 1845.
AAC was perfected in the mid-1920s by the Swedish architect and inventor Dr. Johan Axel Eriksson, working with Professor Henrik Kreueger kreÃ¼ger at The Royal institute Of. Technology it went into production In sweden in 1929 in a factory In haellabrottet hÃ¤llabrottet and quickly became. very popularhen AAC is mixed and cast in forms, several chemical reactions take place that give AAC its light weight (20% of the weight of concrete) and thermal properties. Aluminum powder reacts with calcium hydroxide and water to form hydrogen.