Riddle I am lighter than air but even a hundred people together cannot lift me and I am fragile. I can often be seen but vanish very easily. What am I?

Introduction / Context:
This is a what am I type riddle where an object is described indirectly through its properties. The focus here is on being lighter than air, extremely fragile, and impossible to lift in a meaningful way even by many people. Riddles like this help build imaginative thinking and the ability to connect everyday experiences to abstract descriptions.

Given Data / Assumptions:
- The mystery object is lighter than air.- Even a group of one hundred people cannot lift it in the usual sense.- It is described as fragile and easy to destroy.- The answer is expected to be a common object that most people have seen.

Concept / Approach:
Lighter than air suggests something filled with air or gas, or something that floats instead of falling. The phrase cannot lift me for one hundred people is not about weight but about the impossibility of picking up the object as a solid item. Fragility points toward an object that bursts or breaks with the slightest touch. A soap bubble fits these clues perfectly. It floats in air, cannot really be grasped and lifted because any attempt to hold it causes it to pop, and it is extremely fragile.

Step-by-Step Solution:
Step 1: Consider the property lighter than air. Soap bubbles often rise or drift gently and can appear to float, so they satisfy this description.Step 2: The statement that even a hundred people cannot lift the object must be interpreted as meaning that it cannot be held or carried without breaking. A bubble pops as soon as it is firmly touched.Step 3: Fragility is a key clue. Bubbles break at the slightest contact, far more easily than balloons or feathers.Step 4: Compare this reasoning against the options and recognise that bubble is the only one that fully matches all clauses.

Verification / Alternative check:
Test the alternative options. A balloon can be lifted by one person without difficulty and is not so fragile that it bursts at every touch. Smoke cannot be called fragile in the same way and the riddle uses the word me, suggesting a more concrete object. A feather is light but can certainly be lifted and carried by anyone. Only a bubble matches all three qualities at once.

Why Other Options Are Wrong:
Option B balloon is lighter than air if filled with helium, but it can be tied and lifted, so the condition about a hundred people not being able to lift it does not fit.Option C smoke consists of particles and gas and is not usually described as fragile, nor is it something that one attempts to lift.Option D feather is very light but can be easily lifted and carried, so it contradicts the central part of the riddle.

Common Pitfalls:
Some readers think only in terms of literal weight and get stuck trying to imagine an extremely heavy object, which is the opposite of the clue lighter than air. The trick is to realise that the puzzle plays with the idea of lifting in a different sense. Once you interpret lift as hold without breaking, the image of a bubble becomes immediate.

Final Answer:
The riddle is describing a bubble.