What is the specific gravity of SAE 30 oil, which has a specific weight of 782 times 103N\/m3<\/p>\n\n\n\n
The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n The specific gravity (SG)<\/strong> of SAE 30 oil is calculated using the formula:<\/p>\n\n\n\n [ Given:<\/p>\n\n\n\n [ [ This value is incorrect because the given specific weight is unusually high. Typically, SAE 30 oil has a specific gravity of around 0.87 to 0.89<\/strong> at room temperature.<\/p>\n\n\n\n 1. Understanding Specific Gravity<\/strong> 2. Why the Given Specific Weight Seems Incorrect<\/strong> [ [ Using this corrected value:<\/p>\n\n\n\n [ 3. Importance of Specific Gravity in Lubricants<\/strong><\/p>\n\n\n\n Thus, SAE 30 oil typically has a specific gravity of about 0.87 to 0.89<\/strong>, not 79.8. The given data seems to have an error in magnitude.<\/p>\n","protected":false},"excerpt":{"rendered":" What is the specific gravity of SAE 30 oil, which has a specific weight of 782 times 103N\/m3 The correct answer and explanation is : Answer: The specific gravity (SG) of SAE 30 oil is calculated using the formula: [SG = \\frac{\\text{Specific Weight of the Fluid}}{\\text{Specific Weight of Water}}] Given: [SG = \\frac{782 \\times 10^3}{9.81 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-203976","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/203976","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=203976"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/203976\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=203976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=203976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=203976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Answer:<\/h3>\n\n\n\n
SG = \\frac{\\text{Specific Weight of the Fluid}}{\\text{Specific Weight of Water}}
]<\/p>\n\n\n\n\n
SG = \\frac{782 \\times 10^3}{9.81 \\times 10^3}
]<\/p>\n\n\n\n
SG = 79.8
]<\/p>\n\n\n\nExplanation:<\/h3>\n\n\n\n
Specific gravity (SG) is a dimensionless number that compares the density (or specific weight) of a substance to that of water. It helps engineers and scientists determine how a fluid behaves in different applications.<\/p>\n\n\n\n
A typical SAE 30 oil has a density of around 870 kg\/m\u00b3<\/strong>. If we use the equation:<\/p>\n\n\n\n
\\text{Specific Weight} = \\text{Density} \\times \\text{Gravity}
]<\/p>\n\n\n\n
\\gamma = 870 \\times 9.81 = 8.54 \\times 10^3 \\text{ N\/m}^3
]<\/p>\n\n\n\n
SG = \\frac{8.54 \\times 10^3}{9.81 \\times 10^3} = 0.87
]<\/p>\n\n\n\n\n