20 May, 2000
Fahrenheit to Celsius
May 20, 2000
Around 11:00 PM the air temperature reading was 39.0 degrees Fahrenheit taken from the USCGC Healy docked in St. John's. What is this temperature reading in degrees Celsius?
USCGC Healy Facts
From the USCGC Healy (WAGB-20) brochure:
"The science community provided invaluable input on lab lay-outs and science capabilities during design and construction of the ship. At a time when scientific interest in the Arctic Ocean basin is intensifying, HEALY enhances U.S. Arctic research capabilities substantially.
As a Coast Guard cutter, HEALY is also a capable platform for supporting other potential missions in the polar regions, including logistics, search and rescue, ship escort, environmental protections, and enforcement of laws and treaties."
As the locals say, if you don't like the weather in St. Johns, wait 5 minutes. It will change. Aside from some fog and chilling winds on my Signal Hill hike to Cabot Tower, we have been fortunate to have plenty of sunshine. In town, the daffodils and tulips are blooming and we are reminded of springtime. Compared to our Arctic Healy experiences, it feels beautifully warm to us. Once the sun sets, the temperature quickly drops.
How is temperature in degrees Fahrenheit translated to degrees Celsius? I asked Robert Wolfe, a Research and Development Officer, from Ottawa, Ontario, Canada this question. Robert supplied me with the following information: "Enter this table with temperature Fahrenheit, F; Celsius (centigrade), C; or Kelvin, K; and take out the corresponding readings on the other two temperature scales.
On the Fahrenheit scale, the freezing temperature of pure water at standard sea level pressure is 32 deg, and the boiling point under the same conditions is 212 deg. The corresponding temperatures are 0 deg and 100 deg on the Celsius scale and 273.15 deg and 373.15 deg, respectively, on the Kelvin scale. The value of (-) 273.15 deg C for absolute zero, the starting point of the Kelvin scale, is the value recognized officially by the National Institute of Standards and Technology (NIST).
The formulas are:
C = 5/9 (F - 32 deg) = K - 273.15 deg
F = 9/5 (C + 32 deg = 9/5 K - 459.67 deg
K = 9/5 (F + 459.67 deg) = C + 273.15 deg
Compare the air temperature where you live with our air temperature in St. John's, Newfoundland, Canada in both degrees Fahrenheit and Celsius. Then compare it to the air temperature we experienced on the Healy in my journal of May 13, 2000 "Saturday Notes".
Data on ice core 11A of April 19, 2000 follows.
Core 11A level ice first testing floe
19-April-00 Total length 41 cm
decimal degrees degrees minutes
Latitude 64 04 62
Longitude 61 29 59
Brine volume for -2>T>-22.9
Brine volume coefficients:
F1(T) COEF. -4.732 -22.4500 -0.640 -0.011
F2(T) COEF. 8.90E-02 -0.01800 -0.001 0.000
Comments: Time 1322 GMT, White band at 4-5cm, diameters are irregular
depth cm temp C salinity weight g
05 -2.7 8.9 250.60
15 -2.5 6.1 305.02
25 -2.2 4.4 337.02
35 -1.9 6.1 352.24
length mm diameter mm density
76.15 69.05 0.879
89.72 69.15 0.905
97.2 69.4 0.917
99.4 70.3 0.913
RHOI bine vol air vol
0.9174 0.1521 0.06226
0.9174 0.1161 0.02828
0.9173 0.0968 0.01290
0.9173 0.1561 0.02352
porosity strength mpa strength psi
0.2143 0.178 25.8
0.1444 0.237 34.4
0.1097 0.283 41.0
0.1796 0.172 25.0
average brine vol 0.1216
average strength mpa 0.226
average strength psi 32.8
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