Question

velocity of sound in gases: my physics book says newton assumed that when sound waves travel through a gas, the regions of compression and rarefaction are formed so slowly that the temperature of hte medium remains the same. Thus, in the a compression, heat is produced and lost, and in a rarefaction, heat is gained from the surrounding. Thus isothermal conditions are observed. Laplace corrected him by saying the c and r occur so rapidly taht the heat loss and gain do not occur at all, thus it is not isothermal but adiabatic conditions that are observed.
Could anyone put this in simpler terms