The passenger aeroplanes cruise at the height of 30,000 to 42,000 feet above sea level. Have you ever wondered why? To answer the question, multiple factors come into play. Factors like air density, air pressure and others. Here we have explained why it is ideal for the aircraft to cruise at such heights. To give you a perspective of the height, the highest point on earth is Mount Everest is 8,848.86 m (around 29.031 feet) in December 2020, as certified by the Foreign Ministers of Nepal and China.
The relation between height, air pressure and flight
Moving away from the earth’s surface, the density of the air decreases proportionately. It is simply because the earth’s gravity pulls the air molecules closer to the earth’s surface. This means that with increasing height, there are fewer molecules of air.
Reduced air pressure means less oxygen in the air for breathing, which is why planes are pressured to compensate for the loss of air pressure at high altitudes. Everyone knows that if the plane loses pressurisation for any reason, an oxygen mask will be lowered from above your head.
Regarding flight, the aviators choose to fly high because at these altitudes, because of the lower air density, the aircraft has to face lesser air resistance, making it easier to fly. This can make the aircraft go faster while burning comparatively lesser fuel making it more economical.
Modern jet plane engines, known as turbofans, are most efficient when flown at high altitudes. When jet engines operate at their maximum RPM or exhaust temperature limits, they are more efficient. Because the air becomes thinner as the plane rises in altitude, the engines produce less thrust. This implies the plane can go significantly quicker while consuming less gasoline.
The relation between height, weather and flight
The weather changes at such great heights are minimal because of the decreased pressure changes, which makes the flight much more comfortable for the passengers. It is essential to avoid extreme weather during a flight because of the added turbulence, which at times can be dangerous.
Avoiding hazards and traffic
Flying at such high speed has its downsides. You must have heard of bird strikes damaging the plane’s windshield or other parts, leading to severe accidents. Such situations can be avoided at higher altitudes. Coming to the traffic, it is to be noted that there are other means of aircraft like helicopters, drones or other light aircraft which contribute to the air traffic but are incapable of flying at higher altitudes.
Read Full Article
';
$('div.listing').append(string);
}
});
},
error:function(xhr){
//console.log("Error");
//console.log("An error occured: " + xhr.status + " " + xhr.statusText);
nextload=false;
},
complete: function(){
$('div.listing').find(".loading-block").remove();;
pg +=1;
//console.log("mod" + ice%2);
nextpath="&page=" + pg;
//console.log("request complete" + nextpath);
cat = "?cat=1176365";
//console.log(nextpath);
nextload=(ice%2==0)?true:false;
}
});
}
//lastoff = last.offset();
//console.log("**" + lastoff + "**");
});*/
var maindiv = false;
var dis = 0;
var fbcontainer="";
var fbid = '';
var fb_script=document.createElement('script');
fb_script.text= "(function(d, s, id) {var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) return;js = d.createElement(s); js.id = id;js.src="https://connect.facebook.net/en_GB/sdk.js#xfbml=1&version=v2.9";fjs.parentNode.insertBefore(js, fjs);}(document, 'script', 'facebook-jssdk'));";
var fmain = $(".sr2470498");
//alert(x+ "-" + url);
var fdiv = '
';
//console.log(fdiv);
//$(fb_script).appendTo(fmain);
$(fdiv).appendTo(fmain);
function fillElementWithAd($el, slotCode, size, targeting){
if (typeof targeting === 'undefined') {
targeting = {};
} else if ( Object.prototype.toString.call( targeting ) !== '[object Object]' ) {
targeting = {};
}
var elId = $el.attr('id');
//console.log("elId:" + elId);
googletag.cmd.push(function(){
var slot = googletag.defineSlot(slotCode, size, elId);
for (var t in targeting){
slot.setTargeting(t, targeting
}
slot.addService(googletag.pubads());
googletag.display(elId);
//googletag.pubads().refresh([slot]);
});
}
$(document).delegate("button[id^='mf']", "click", function(){
fbcontainer="";
fbid = '#' + $(this).attr('id');
var sr = fbid.replace("#mf", ".sr");
$(fbid).parent().children(sr).toggle();
fbcontainer = $(fbid).parent().children(sr).children(".fb-comments").attr("id");
});
function onPlayerStateChange(event){
var ing, fid;
//console.log(event + "---player");
$('iframe[id*="video-"]').each(function(){
_v = $(this).attr('id');
//console.log("_v: " + _v);
if(_v != event){
//console.log("condition match");
ing = new YT.get(_v);
if(ing.getPlayerState()=='1'){
ing.pauseVideo();
}
}
});
$('div[id*="video-"]').each(function(){
_v = $(this).attr('id');
//console.log("_v: " + _v + " event: " + event);
if(_v != event){
//jwplayer(_v).play(false);
}
});
}
function onYouTubePlay(vid, code, playDiv,vx, pvid){
if (typeof(YT) == 'undefined' || typeof(YT.Player) == 'undefined') {
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
window.onYouTubePlayerAPIReady = function() {
onYouTubePlayer(vid, code, playDiv,vx, pvid);
};
}else{onYouTubePlayer(vid, code, playDiv,vx, pvid);}
}
function onYouTubePlayer(vid, code, playDiv,vx, pvid){
//console.log(playDiv + "Get Youtue " + vid);
//$("#"+vid).find(".playvideo-"+ vx).hide();
var player = new YT.Player(playDiv , {
height: '450',
width: '100%',
videoId:code,
playerVars: {
'autoplay': 1,
'showinfo': 1,
'controls': 1
},
events: {
'onStateChange': function(event){
onPlayerStateChange(event.target.a.id);
}
}
});
$("#video-"+vid).show();
}
function kalturaPlayerAPIReady(code, playDiv,pvid){
var dt=new Date;
var nt=dt.getTime();
var vtitle = "";
var video_id_arr = code.split("https://zeenews.india.com/");
var youbora_video_id = video_id_arr[5].split(".");
var youbora_video_id = '"' + youbora_video_id[0] + '"';
pre_roll = "https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/11440465/Zeenews_English_Video/Zeenews_English_Preroll&tfcd=0&npa=0&sz=640x480&gdfp_req=1&output=vast&unviewed_position_start=1&env=vp&impl=s&description_url="+vtitle+"&correlator="+nt;
var sources ={};
var config = {
targetId: playDiv,
provider: {
partnerId: 2504201
},
playback: {
pictureInPicture : true,
autoplay: true
},
advertising: {
adBreaks: [{
position: 0,
ads: [{
url: [pre_roll]
}]
}]
},
plugins: {
youbora: {
options: {
"content.title": "Aviation Trivia: Know why Aeroplanes fly at heights more than 30,000 feet",
"content.customDimension.1":"Zee News",
"content.customDimension.2":"https://zeenews.india.com/",
"content.customDimension.3":"2022-Jun-04 17:41:30",
"content.customDimension.4":"Amulya Raj",
"content.customDimension.5":"2470498",
"content.customDimension.6":"Aviation,Aviation,Aeroplane,Aviation Trivia,Aviation Explainer",
"content.id":youbora_video_id,
"content.language":"English"
}
},
ima: {
adsResponse: ""
}
}
}
var kalturaPlayer = KalturaPlayer.setup(config);
if(kalturaPlayer){
kalturaPlayer.reset();
}
var videoUrl = code;
var mediaid = '"zn' + pvid + '"';
sources = {
hls: [{
id: mediaid,
url: videoUrl,
mimetype: "application/x-mpegURL"
}]
}
kalturaplayerSetup(kalturaPlayer, sources);
if (typeof kalturaPlayer !== 'undefined') {
doRegisterEvents(kalturaPlayer);
}
}
function kalturaplayerSetup(kalturaPlayer, playbackType){
kalturaPlayer.setMedia({
plugins: {},
sources: playbackType
});
}
function doRegisterEvents(kalturaPlayer) {
/* player event*/
kalturaPlayer.addEventListener(kalturaPlayer.Event.Core.PLAY, playEvent);
kalturaPlayer.addEventListener(kalturaPlayer.Event.Core.PAUSE, pauseEvent);
kalturaPlayer.addEventListener(kalturaPlayer.Event.Core.PLAYBACK_ENDED, playbackEndedEvent);
/* ad event */
kalturaPlayer.addEventListener(kalturaPlayer.Event.AD_STARTED, adStartedEvent);
kalturaPlayer.addEventListener(kalturaPlayer.Event.AD_COMPLETED, adCompletedEvent);
kalturaPlayer.addEventListener(kalturaPlayer.Event.AD_SKIPPED, adSkippedEvent);
kalturaPlayer.addEventListener(kalturaPlayer.Event.AD_CLICKED,adClicked);
}
var vlabel = "https://zeenews.india.com"+$(this).attr("video-path");
var isVideoPlayed = false;
var isAdSkippedCompleted = false;
function adStartedEvent(event) {
var videotype = "zee english video";
gtag('event', 'Adstarted', { 'event_category': videotype, 'event_label': vlabel});
gtag('event', 'Play', { 'event_category': videotype, 'event_label': vlabel});
isVideoPlayed = true;
isAdSkippedCompleted = true;
}
function adCompletedEvent(event) {
var videotype = "zee english video";
gtag('event', 'Adcompleted', { 'event_category': videotype, 'event_label': vlabel});
isAdSkippedCompleted = true;
}
function adSkippedEvent(event) {
var videotype = "zee english video";
gtag('event', 'Adskipped', { 'event_category': videotype, 'event_label': vlabel});
isAdSkippedCompleted = true;
}
function adClicked(event) {
var videotype = "zee english video";
gtag('event', 'Adclicked', { 'event_category': videotype, 'event_label': vlabel});
}
function playbackEndedEvent(event){
var videotype = "zee english video";
gtag('event', 'Complete', { 'event_category': videotype, 'event_label': vlabel});
}
function playEvent(event) {
var videotype = "zee english video";
if((isVideoPlayed) && (isAdSkippedCompleted)){
isAdSkippedCompleted = false;
}else if((isVideoPlayed)){
gtag('event', 'resume', { 'event_category': videotype, 'event_label': vlabel});
}else{
gtag('event', 'Play', { 'event_category': videotype, 'event_label': vlabel});
isVideoPlayed = true;
}
}
function pauseEvent(event) {
var videotype = "zee english video";
gtag('event', 'Pause', { 'event_category': videotype, 'event_label': vlabel});
}
function AdloadEvent(event) {
var videotype = "zee english video";
gtag("event", "kaltura_adloaded", { "event_category": videotype, "event_label": vlabel});
}
function AdProgressEvent(event) {
var videotype = "zee english video";
gtag("event", "kaltura_adprogress", { "event_category": videotype, "event_label": vlabel});
}
function adPausedEvent(event) {
var videotype = "zee english video";
gtag("event", "kaltura_adpaused", { "event_category": videotype, "event_label": vlabel});
}
/* End of Kaltura player function code */
$(document).delegate("div[id^='play']", "click", function(){
//console.log($(this).attr("id"));
//console.log($(this).attr("video-source"));
//console.log($(this).attr("video-code"));
var isyoutube = $(this).attr("video-source");
var vurl = $(this).attr("video-path");
var vid = $(this).attr("id");
$(this).hide();
var pvid = $(this).attr("newsid");
var vx = $(this).attr("id").replace('play-','');
var vC = $(this).attr("video-code");
var playDiv = "video-" + vid + "-" + pvid;
if(isyoutube =='No'){
kalturaPlayerAPIReady(vC, playDiv,pvid);
}else{
onYouTubePlay(vid, vC, playDiv,vx, pvid);
}
});
$(document).delegate("div[id^='ptop']", "click", function(){
var vid = $(this).attr("id").replace('ptop','');
$(this).hide();
var pvid = $(this).attr("newsid");
var vurl = $(this).attr("video-path");
//console.log($(this).attr("id") + "--" + vid);
//console.log($(this).parent().children().find('#play-'+vid).attr("video-source"));
//console.log($(this).parent().children().find('#play-'+vid).attr("video-code"));
var isyoutube = $(this).parent().children().find('#play-'+vid).attr("video-source");
var vC = $(this).parent().children().find('#play-'+vid).attr("video-code");
var playDiv = "mvideo-play-" + vid + "-" + pvid;
if(isyoutube =='No'){
//console.log(jwplayer($(this).attr("id")).getState());
kalturaPlayerAPIReady(vC, playDiv,pvid);
}else{
onYouTubePlay($(this).attr("id"), vC, playDiv, vid, pvid);
}
});
var nxti = 3;
var ci = 1;
var nxti_1 = 6;
var nxti_2 = 9;
var nxti_3 = 12;
if($.autopager==false){
var use_ajax = false;
/*var disqus_shortname="zeehindi";
var disqus_identifier; //made of post id and guid
var disqus_url; //post permalink
function loadDisqus(source, identifier, url, nid) {
if (window.DISQUS) {
//alert("if");
jQuery('
').insertAfter(source);
jQuery('#disqus_thread').insertAfter(source); //append the HTML after the link
//if Disqus exists, call it's reset method with new parameters
DISQUS.reset({
reload: true,
config: function () {
this.page.identifier = identifier;
this.page.url = url;
}
});
}else{
jQuery('
').insertAfter(source);
disqus_identifier = identifier; //set the identifier argument
disqus_url = url; //set the permalink argument
//append the Disqus embed script to HTML
var dsq = document.createElement('script'); dsq.type="text/javascript"; dsq.async = true;
dsq.src="http://" + disqus_shortname + '.disqus.com/embed.js';
jQuery('head').append(dsq);
}
};*/
/*$('.disqusOn').live( "click", notify );
function notify() {
identifier = $(this).attr('id');
dUrl = $(this).attr('disqus-url');
source = $(this).parent();
loadDisqus(jQuery(this), identifier, dUrl);
}*/
function loadshare(curl){
history.replaceState('' ,'', curl);
if(window.OBR){
window.OBR.extern.researchWidget();
}
//console.log("loadshare Call->" + curl);
//$('html head').find('title').text("main" + nxtTitle);
if(_up == false){
var cu_url = curl;
gtag('config', 'UA-2069755-1', {'page_path': cu_url });
if(window.COMSCORE){
window.COMSCORE.beacon({c1: "2", c2: "9254297"});
var e = Date.now();
$.ajax({
url: "/marathi/news/zscorecard.json?" + e,
success: function(e) {}
})
}
//console.log('ga:'+r);
/*(function () {
var ga = document.createElement('script'); ga.type="text/javascript"; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://' : 'http://') + 'stats.g.doubleclick.net/dc.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();*/
//console.log("loadshare Call");
}
}
if(use_ajax==false) {
//console.log('getting');
var view_selector="div.center-section"; // + settings.view_name; + '.view-display-id-' + settings.display;
var content_selector = view_selector; // + settings.content_selector;
var items_selector = content_selector + ' > div.rep-block'; // + settings.items_selector;
var pager_selector="div.next-story-block > div.view-zn-article-mc-all-2017 > div.view-content > div.clearfix"; // + settings.pager_selector;
var next_selector="div.next-story-block > div.view-zn-article-mc-all-2017 > div.view-content > div.clearfix > a:last"; // + settings.next_selector;
var auto_selector="div.tag-block";
var img_location = view_selector + ' > div.rep-block:last';
var img_path="
Loading
"; //settings.img_path;
//var img = '
' + img_path + '
';
var img = img_path;
//$(pager_selector).hide();
//alert($(next_selector).attr('href'));
var x = 0;
var url="";
var prevLoc = window.location.pathname;
var circle = "";
var myTimer = "";
var interval = 30;
var angle = 0;
var Inverval = "";
var angle_increment = 6;
var handle = $.autopager({
appendTo: content_selector,
content: items_selector,
runscroll: maindiv,
link: next_selector,
autoLoad: false,
page: 0,
start: function(){
$(img_location).after(img);
circle = $('.center-section').find('#green-halo');
myTimer = $('.center-section').find('#myTimer');
angle = 0;
Inverval = setInterval(function (){
$(circle).attr("stroke-dasharray", angle + ", 20000");
//myTimer.innerHTML = parseInt(angle/360*100) + '%';
if (angle >= 360) {
angle = 1;
}
angle += angle_increment;
}.bind(this),interval);
},
load: function(){
$('div.loading-block').remove();
clearInterval(Inverval);
//$('.repeat-block > .row > div.main-rhs2470498').find('div.rhs2470498:first').clone().appendTo('.repeat-block >.row > div.main-rhs' + x);
$('div.rep-block > div.main-rhs2470498 > div:first').clone().appendTo('div.rep-block > div.main-rhs' + x);
$('.center-section >.row:last').before('