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<div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/hot_plane.m4a' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Why Cant Some Planes Fly in Hot Weather?' data-article-id='2456'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='8500'>It is sometimes more difficult to get airplanes off the ground in extremely hot weather.</span> <span data-start-time='8500' data-end-time='15146'>But the problem is not the temperature itself or the humidity.</span> <span data-start-time='15146' data-end-time='20500'>It is the air density that can get in the way.</span> <span data-start-time='20500' data-end-time='23875'>Hotter air gets thinner.</span> <span data-start-time='23875' data-end-time='31125'>Thin air makes it more difficult for planes to lift and land safely.</span> <span data-start-time='31125' data-end-time='36958'>This is especially the case with smaller planes.</span> <span data-start-time='36958' data-end-time='46438'>That is why more than 50 flights were canceled in the southwestern United States earlier this week.</span> <span data-start-time='46438' data-end-time='52854'>Temperatures there have climbed to 49 degrees Celsius.</span> <span data-start-time='52854' data-end-time='67333'>Airplanes take off and stay in the air because of lift -- the force from the movement of air under the plane&rsquo;s wings that push it upward.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/1939/hot_planes.jpg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=8872 data-hint-location='23875' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/what_does_lift_mean.m4a'>What does lift mean?</div><div class='choices' data-correct-choice='boost'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/land.m4a'><span>land</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/boost.m4a'><span>boost</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/heat.m4a'><span>heat</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/fly.m4a'><span>fly</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=8873 data-hint-location='15146' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/what_causes_the_problem.m4a'>What causes the problem?</div><div class='choices' data-correct-choice='density'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/density.m4a'><span>density</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/lift.m4a'><span>lift</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/temperature.m4a'><span>temperature</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/humidity.m4a'><span>humidity</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=8874 data-hint-location='20500' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/hotter_air_gets__blank_.m4a'>Hotter air gets <span class='blank'>thinner</span>.</div><div class='choices' data-correct-choice='thinner'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/less_humid.m4a'><span>less humid</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/more_lift.m4a'><span>more lift</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/thinner.m4a'><span>thinner</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1939/denser.m4a'><span>denser</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button class='speak-button'></button></div></div></div>

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