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Ans. 2: Relation between temperatures measured in units Celsius degree and kelvin is as follows:
Temp in kelvin = Temp in degree Celsius + 273.15
It is a linear relation which can be concluded to the result that absolute temperatures on these above two different scales (units) differ by 273.15 but whenever we talk about “change in temperatures”, there will not be any difference in these two units. A 70 degree Celsius change in temperature is same as 70 kelvin degree change on Kelvin scale.
So the answer is: “The rise in temperature is 70 degree kelvin.”
Ans.3: Temperature of ambient air is -40 degree Celsius.
Relation between other temperature units and degree Celsius are following, using which temperature in respective units can be easily calculated:
(a.) F = (9*C/5) +32 = (9* (-40)/5) +32 = (-40) , so in Fahrenheit units ambient temperature is -40 degree Fahrenheit. (Note that at -40 degree Celsius, both Fahrenheit scale and Celsius scale co-insides.)
(b.) K = C+273.15 = -40+273.15 = 233.15, so in kelvin units, temperature is 233.15 degree kelvin.
(c.) R = (9*C/5) +491.69= (9*(-40)/5) +491.69 = 419.69, so in Rankine units ambient temperature is 419.69 degree Rankine.