Why does this C code produce a double instead of a float?

celsius = (5.0/9.0) * (fahr-32.0);

celsius = (5.0F/9.0F) * (fahr-32.0F);

#include <stdio.h>
int main() {
  float celsius;
  float fahr = 212;
  printf("sizeof(celsius) ---------------------> %dn", sizeof(celsius));
  printf("sizeof(fahr) ------------------------> %dn", sizeof(fahr));
  printf("sizeof(double) ----------------------> %dn", sizeof(double));
  celsius = (5.0f/9.0f) * (fahr-32.0f);
  printf("sizeof((5.0f/9.0f) * (fahr-32.0f)) --> %dn", sizeof((5.0f/9.0f) * (fahr-32.0f)));
  printf("sizeof((5.0/9.0) * (fahr-32.0)) -----> %dn", sizeof((5.0/9.0) * (fahr-32.0)));
  printf("celsius -----------------------------> %fn", celsius);
}

sizeof(celsius) ---------------------> 4
sizeof(fahr) ------------------------> 4
sizeof(double) ----------------------> 8
sizeof((5.0f/9.0f) * (fahr-32.0f)) --> 4
sizeof((5.0/9.0) * (fahr-32.0)) -----> 8
celsius -----------------------------> 100.000008