The weight of a balloon is `W_(1)` when empty and `W_(2)` when filled with air. Both are weighed in air by the same sensitive spring balance and under identical conditions.

Why do the shape and size of a balloon change when filled with air or water ?

A soft plastic bag of weight w_(0) is filled with air at STP Now, weigth of the bag is w in air. Then,

Explain why a soft plastic bag weighs the same when empty or when filled with air at atmospheric pressure ? Would the weights be the same if measured in vacuum ?

statement 1 is false, statement 2 is true. Statement-1: A soft plastic bag weights the same when empty or when filled with air and measured in vacuum. Statement-2: The same results will be observed when measured in air.

The weight of a body in air is 50 N. When the same body is weighed in water its weight decreases by 5N. Calculate the density of the given body.

The apparent weight of a man in a lift is W_(1) when lift moves upwards with some acceleration and is W_(2) when it is accerating down with same acceleration. Find the true weight of the man and acceleration of lift .

A density bottle weighs 100 g when filled with liquid annd 80 g when filled with water. If the weight of an empty density bottle is 20 g, find the density of the liquid.