{"product_id":"2940013583559","title":"Three Coal Mine Ventilation Studies Using Sulfur Hexafluoride Tracer Gas","description":"This report describes three coal mine ventilation studies by the Bureau of Mines in which sulfur hexafluoride (sf6) was used as a tracer gas. One of these studies was conducted to determine air movement and leakage in a sealed area. Another was run to determine the ventilation efficiency of a bleeder system. Finally, a study was made of air leakage across permanent stoppings of parallel intake airways. These studies proved sulfur hexafluoride to be a useful addition to the equipment commonly used in coal mine ventilation analysis.","brand":"1001 Property Solutions LLC","offers":[{"title":"Default Title","offer_id":47082934206704,"sku":"2940013583559","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/2940013583559_p0.jpg?v=1763583190","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/2940013583559","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}