[소방기사] 02. 소방설비기사(기계) 유체역학 - 비중, 비중량, 부력 문제

This is a question about specific gravity, specific weight, and buoyancy. Specific gravity can be expressed as a ratio of specific weights or a ratio of densities. Specific gravity can be calculated based on specific weight (density), and buoyancy can be easily calculated based on specific gravity. We can determine buoyancy from the difference in specific gravity. ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ There was a request for correction in the comments, so I'm including the correction. ^^ In the process of deriving buoyancy... The strict definition of buoyancy is a force acting on an object in the opposite direction of gravity. Therefore, in the equation, buoyancy should be F2-F1=FB(buoyancy), not the derived F2-F1'=FB(buoyancy). To make problem solving easier, I derived the equation by factoring in the object's specific gravity. While this shouldn't be a problem when solving exam questions, the equation that defines buoyancy is F2-F1 (no prime), and it's important to note that it doesn't depend on the actual density of the submerged object. A more detailed video on buoyancy will be uploaded separately, so if you're interested, please watch it later. ^^ ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ 0:00 Basic Physical Quantities 6:02 Specific Gravity 9:11 Specific Gravity 13:22 Buoyancy 21:19 Submerged Volume, Visible Volume 23:40 Problem Solving (Previous Exam Questions) #FireEquipmentEngineerMechanicalFireMechanicalFireMechanicalWrittenTest #FireMechanicalFluidMechanics #FreeFireFluidMechanicsLecture #FireFluidMechanics