A 2-m long pipe at 27#"^o#C is heated until it is 2.00024 m at 77#"^o#C. What is the coefficient of linear expansion of the pipe?
The coefficient of linear expansion is the fractional increase in length for a rise in temperature of 1 degree (deg C or Kelvin).
This means that if the length was doubled with a rise of 1 degree then the coefficient would be 2.
For most materials the numbers are much smaller.