{"id":367,"date":"2011-01-05T09:29:05","date_gmt":"2011-01-04T20:29:05","guid":{"rendered":"https:\/\/blog.waikato.ac.nz\/physicsstop\/2011\/01\/05\/sink_or_swim\/"},"modified":"2011-01-05T09:29:05","modified_gmt":"2011-01-04T20:29:05","slug":"sink-or-swim","status":"publish","type":"post","link":"https:\/\/blog.waikato.ac.nz\/physicsstop\/2011\/01\/05\/sink-or-swim\/","title":{"rendered":"Sink or swim?"},"content":{"rendered":"<p>Happy New Year to everyone.&nbsp;&nbsp;I&#8217;m back from holidays now &#8211; a nice week in Tongariro National Park and then a few days at the beach in Bay of Plenty (hoping there are no sharks out there).&nbsp;<\/p>\n<p>One of the disadvantages of living in NZ&#8217;s largest inland city is that it takes a special trip to get to the sea. It&#8217;s been absolutely ages since I&#8217;ve been swimming in something with a salty flavour. So it was very noticeable to me when I ventured into shark territory that I actually&nbsp;float in sea water. In the swimming pool I have to work (just a little) to keep afloat. If I stop moving I slowly head for the bottom, feet first (I&#8217;ve tried).<\/p>\n<p>Humans have a density pretty close to that of water (i.e. 1 kg per litre). Mine is obviously ever so slightly greater than 1, so put me in fresh water and I slowly sink. Some other people would float&nbsp;(I&#8217;m sure I used to float when I was younger). But sea water has a density a little higher than fresh water (about 3% higher on average), on account of the dissolved salt. It&#8217;s not a great deal of difference numerically, but when you have a density very close to 1 it&#8217;s enough to have a noticeable effect. When I lie on my back and keep still in calm sea water I stay where I am. The dissolved salt is enough to keep me afloat.<\/p>\n<p>Unfortunately it&#8217;s probably now going to be the freshwater variety of swimming for a while (more accurately, chlorinated water), but I hope to get over to Raglan before the summer is out.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Happy New Year to everyone.&nbsp;&nbsp;I&#8217;m back from holidays now &#8211; a nice week in Tongariro National Park and then a few days at the beach in Bay of Plenty (hoping there are no sharks out there).&nbsp; One of the disadvantages of living in NZ&#8217;s largest inland city is that it takes a special trip to [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[6],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Sink or swim? : Physics Stop<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.waikato.ac.nz\/physicsstop\/2011\/01\/05\/sink-or-swim\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sink or swim? : Physics Stop\" \/>\n<meta property=\"og:description\" content=\"Happy New Year to everyone.&nbsp;&nbsp;I&#8217;m back from holidays now &#8211; a nice week in Tongariro National Park and then a few days at the beach in Bay of Plenty (hoping there are no sharks out there).&nbsp; One of the disadvantages of living in NZ&#8217;s largest inland city is that it takes a special trip to [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.waikato.ac.nz\/physicsstop\/2011\/01\/05\/sink-or-swim\/\" \/>\n<meta property=\"og:site_name\" content=\"Physics Stop\" \/>\n<meta property=\"article:published_time\" content=\"2011-01-04T20:29:05+00:00\" \/>\n<meta name=\"author\" content=\"Marcus\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Marcus\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.waikato.ac.nz\/physicsstop\/2011\/01\/05\/sink-or-swim\/\",\"url\":\"https:\/\/blog.waikato.ac.nz\/physicsstop\/2011\/01\/05\/sink-or-swim\/\",\"name\":\"Sink or swim? 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