The five teaspoons of salt dissolved in the water increase the density of the water. Once the density of the water is greater than the density of the egg, the egg will float.
It doesn't matter how much salt you use, rather, the concentration is important! For example, if you put your 5-6 teaspoons of salt in a full bathtub, the amount of salt per liter, or per milliliter, will be quite low.
About 6 tablespoons - Check out the link below
5 teaspoons
5 cups of salt
That is approximately 3 teaspoons in average yolk.
0.2 metric teaspoons
That is approximately 5 teaspoons.
1 teaspoon is 5 ml.
1/3 of a cup is 16 teaspoons or 5 1/3 tablaspoons
That is 5 teaspoons.
That is 5 teaspoons.
That is 20 teaspoons