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Hot Air Oven- জীবানুমুক্ত করা হয়-
All glass material
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ANSWER : 1
Descrption
<p class = "MsoNormal"><span style = "font - size: 12.0pt; line - height: 115%;">Hot air ovens are <a title = "Electrical" href = "https://en.wikipedia.org/wiki/Electrical"><span style = "color: windowtext;">electrical</span></a> devices which use <a title = "Dry heat" href = "https://en.wikipedia.org/wiki/Dry_heat"><span style = "color: windowtext;">dry heat</span></a> to <a title = "Sterilization (microbiology)" href = "https://en.wikipedia.org/wiki/Sterilization_(microbiology)"><span style = "color: windowtext;">sterilize</span></a>. They were originally developed by Pasteur. Generally, they use a <a title = "Thermostat" href = "https://en.wikipedia.org/wiki/Thermostat"><span style = "color: windowtext;">thermostat</span></a> to control the temperature. Their double walled insulation keeps the heat in and conserves <a title = "Energy" href = "https://en.wikipedia.org/wiki/Energy"><span style = "color: windowtext;">energy</span></a>, the inner layer being a poor conductor and outer layer being metallic. There is also an air filled space in between to aid <a title = "Thermal insulation" href = "https://en.wikipedia.org/wiki/Thermal_insulation"><span style = "color: windowtext;">insulation</span></a>. An air circulating fan helps in uniform distribution of the heat. These are fitted with the adjustable wire mesh plated trays or <a title = "Aluminium" href = "https://en.wikipedia.org/wiki/Aluminium"><span style = "color: windowtext;">aluminium</span></a> trays and may have an on/off rocker switch, as well as indicators and controls for temperature and holding time. The capacities of these ovens vary. Power supply needs vary from country to country, depending on the <a title = "Voltage" href = "https://en.wikipedia.org/wiki/Voltage"><span style = "color: windowtext;">voltage</span></a> and <a title = "Utility frequency" href = "https://en.wikipedia.org/wiki/Utility_frequency"><span style = "color: windowtext;">frequency</span></a> (<a title = "Hertz" href = "https://en.wikipedia.org/wiki/Hertz"><span style = "color: windowtext;">hertz</span></a>) used. Temperature sensitive tapes or biological indicators using <a title = "Bacterial spores" href = "https://en.wikipedia.org/wiki/Bacterial_spores"><span style = "color: windowtext;">bacterial spores</span></a> can be used as controls, to test for the <a title = "Efficacy" href = "https://en.wikipedia.org/wiki/Efficacy"><span style = "color: windowtext;">efficacy</span></a> of the device during use.</span></p>
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