Why boiling water does not overflow? - Science & Technology
Q. Why does boiling milk overflow but boiling water does not?
1. Slightly heavier than water
2. Milk is more viscous than water
3. Increased pressure below bubbles
Which of these statements are true? - Published on 06 May 15a. 1,2
b. 2,3
c. 1,3
d. All
ANSWER: All
Milk is a mix of butter fat and water so it is slightly heavier than water.
Milk is more viscous then water because it is a bit thicker. Viscosity is a measure of a fluid's resistance to flow. When you boil milk, the liberated gas trapped inside expands and forms bubbles. But unlike water, where the bubbles simply rise to the surface and pop, releasing the gas, milk contains protein and fat, which during the boiling process, separate from the rest of the mixture and form a membrane at the top of the liquid. Membrane effectively prevents the expanding gas bubbles from bursting butincreasing pressure forces body of liquid rises up and overflows.
