Simplify the following text for a Grade 8 native English-speaking person.
Original: For scientific calculations , room temperature is usually taken to be either 20 or 25 degrees Celsius ( 293 or 298 kelvin ( K ) , 68 or 77 degrees Fahrenheit ) .
Simplified: For scientific work , room temperature is taken to be about 20 to 25 degrees Celsius with an average of 23 Â C ( about 73.4 degrees Fahrenheit ( Â F ) , 528 to 537 degrees Rankine ( Â R ) , or 293 to 298 Kelvins ( K ) ) .