\"K\" in airtightness"
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1. Calculation method for leakage rate: The leakage rate S = (1 – P2t1/P1t2) × 100%. In this formula, P1 represents the system pressure at the start of the test, P2 represents the system pressure at the end of the test, t1 represents the system temperature at the start of the test (in K), and t2 represents the system temperature at the end of the test (in K). 2. A leakage rate of S < 0.2% indicates satisfactory airtightness; if S > 0.2%, the airtightness is considered unsatisfactory. We can all find this formula on the internet. Now the question is: what is the unit of \"t\" in the formula? What’s the temperature in °C? Should we still use 272.15 Kelvin? Please ask an expert to answer! ~~~
t1 represents the system temperature in Kelvin at the start of the experiment. As stated in your instructions, temperatures are expressed in Kelvin; for example, 0 degrees Celsius is equivalent to 273 K.
K has already been mentioned in the text. Moreover, P also needs to be calculated using absolute pressure, plus 0.1 Mpa
For airtightness, refer to AQ 5212—2011; the unit to use is K