{"version":"1.0","provider_name":"SJ Gauge | \u0110\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t, nhi\u1ec7t k\u1ebf v\u00e0 c\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t","provider_url":"https:\/\/www.sj-gauge.com\/vi","author_name":"SJ Gauge","author_url":"https:\/\/www.sj-gauge.com\/vi\/author\/sj-gauge\/","title":"Why Can`t a Vacuum Gauge Reach -760 mmHg? How Does a Pressure Gauge Measure Vacuum?","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"MVNUXanMB0\"><a href=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-vacuum-issues\/\">T\u1ea1i sao \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u1ebfn m\u1ee9c -760 mmHg? \u0110\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t \u0111o ch\u00e2n kh\u00f4ng nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.sj-gauge.com\/vi\/pressure-gauge-vacuum-issues\/embed\/#?secret=MVNUXanMB0\" width=\"600\" height=\"338\" title=\"\u201cT\u1ea1i sao \u0111\u1ed3ng h\u1ed3 \u0111o ch\u00e2n kh\u00f4ng kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u1ebfn -760 mmHg? \u0110\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t \u0111o ch\u00e2n kh\u00f4ng nh\u01b0 th\u1ebf n\u00e0o?\u201d \u2014 SJ Gauge | \u0110\u1ed3ng h\u1ed3 \u0111o \u00e1p su\u1ea5t, nhi\u1ec7t k\u1ebf v\u00e0 c\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t\" data-secret=\"MVNUXanMB0\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/www.sj-gauge.com\/wp-includes\/js\/wp-embed.min.js\n<\/script>","thumbnail_url":"https:\/\/www.sj-gauge.com\/wp-content\/uploads\/2026\/04\/SJ-Gauge-Pressure-Gauge-Measure-VacuumBN.jpg","thumbnail_width":800,"thumbnail_height":500,"description":"A vacuum gauge should reach -760 mmHg under ideal conditions, but in real applications, it often falls short. Learn the common causes such as leaks, faulty gauges, and system limitations, and how to improve vacuum performance."}