A bubble is present at the bottom of a pool.

Assuming that the temperature of the pool is constant throughout the water,which of the following describes the change of the pressure and density of air in the bubble as it rises to the surface:

PRESSURE DENSITY

A)INCREASE DECREASE

B)INCREASE INCREASE

C)DECREASE INCREASE

D)DECREASE DECREASE

(please give the reason also)

I want  complete notes on the chapter friction 

In my book subtopics are:

Friction 

Types of friction 

Factors affecting friction 

Methods of reducing friction 

Methods of increasing friction 

Advantages and disadvantages of friction 

Some real life based situation where friction is applied.

How to make a monomer into polymer if it is an addition polymer example

This planet, _______ is yellowish in colour and has many rings and satellites.

A. Uranus

B. Jupiter

C. Neptune

D. Saturn

Pasteurized milk does not need to be boiled. Why?

Write the $pH$ value of the

1. Saliva (before meal)

2. Saliva (after meal)

3. Lemon juice

4. Colourless aerated drink

5. Carrot juice

6. Coffee

7. Tomato juice

8. Tap water