Heat, for Advanced Students

Heat, for Advanced Students

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ... strong sulphuric acid (see p. 184). Example. Calculate the pressure and temperature corresponding to the triple point for water. We will determine the co-ordinates of the point of intersection of the steam line with the ice line. According to Dewar's Experiments (p. 179) an increase of one atmosphere lowers the melting point of ice by 0-0072 C. Hence under zero pressure ice will melt at O'OO72 C. It is easy to see that the temperature corresponding to the triple point will be between o C. and 0-0072 C. For ice cannot in any circumstances be formed above 0-0072 C.; and in order that ice should melt below o C., the pressure must be greater than one atmosphere. Taking the standard atmosphere as equal to 760 mm. of mercury, we see that for a depression of 1 C. in the freezing point of water, the pressure must be increased by 105,000 mm. Therefore under a pressure of p mm. of mercury, ice will melt at (O'OO72----1 C. 105, ooo/ At 0 C. the pressure of saturated aqueous vapour is equal to 4'60 mm., whilst at 1 C. the pressure amounts to 4-94 mm. Therefore in the neighbourhood of 0 C., the pressure / corresponding to a temperature t C. will be equal to 4'6o + (4'94-4'6oX=4'6o+-34/. 't = '34 The temperature / must be equal to the melting point of ice under a pressure of/ mm. of mercury. t-4-60 f.-.--= 0-0072 '. '34 105,000.-. 1o5, ooo/-483,000 = 257-108-'34/..-. #(105,000 +-34) = 483,000 + 257-108.. 483,257-108 105,000-34' = 4 '60243 mm. of mercury. This is the pressure corresponding to the triple point. Substituting this value in the equation for the melting point of ice under a pressure p, we get, for the temperature / corresponding to the triple point t =-0072---"--13---0072---000043 = 0-007157 C. Triple Point Curves for a substance which contracts...show more

Product details

  • Paperback | 140 pages
  • 189 x 246 x 8mm | 263g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236647807
  • 9781236647801