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Celebrate the scientist in you with two exciting DIYs

Team StoryWeavers|May 27, 2019, 09:33 IST| 67

Imagine being a part of a mission that will script the history of a nation. What if you were a part of a team of top scientists and researchers, secretly executing this mission. Doesn’t this sound like the storyline of a spy thriller? Wait! This is the true story of India’s Operation Shakti or Pokhran – II, which was launched on May 11, 1998.

The country’s top notch scientists and researchers put in their heart and soul for the success of this ambitious project. Operation Shakti was the brainchild of former president late Dr APJ Abdul Kalam and his team of prolific scientists, including  Dr Rajagopala Chidambaram, K Santhanam, Dr Anil Kakodkar, M S Ramakumar, S K Sikka, Dr D D Sood, G Govindrajan, S K Gupta among others.

May 11, 1998, is an important day in the history of science and technology in India, as it marked three remarkable events that put India on the global map, as one of the tech-empowered nations in the world.   

The three defining events are:

Shakti or Pokhran II was an experiment launched to test India’s nuclear power. A series of five nuclear tests were conducted in Pokhran, Rajasthan. These experiments resulted in India becoming the sixth nuclear country in the world.

Hansa-3, an aircraft built by the National Aerospace Laboratories (NAL), was successfully test flown in Bangalore. It was the first indigenously built aircraft in the country, making way to become self-sustained in the field of aeronautical sciences.

Trishul: A full-range guided flight of Trishul-a missile developed by the Defence Research and Development Organisation (DRDO)-was successfully test fired on this day. It was one of the Navy’s first anti-sea skimming missile.

Given these successes in the field of technology, May 11 was declared as the National Technology Day by former Prime Minister late Atal Bihari Vajpayee. He envisioned this day to symbolize the quest for scientific inquiry, technological creativity and translation of that quest in the integration of Science, Society and Industry.’ The Indian government celebrates this day by awarding innovations by individuals and industries in the field of science and technology every year, since then.

Now that you know the story behind the historic May 11, you may wonder as students, what could  you do? Perhaps, celebrate science in everyday life.

This National Technology Day, let the scientist in you bloom! We have two Do It Yourself (DIY) experiments for you. We’re sure these experiments will pique your curiosity and teach you a lesson or two in science.     

DIY Experiment: Hot and Cold Air Experiment

Grades: 4 – 8

Materials needed:

  1. Two wide mouth containers
  2. A two-litre plastic bottle with a narrow mouth
  3. Lukewarm water
  4. Ice cubes
  5. Cold water
  6. A balloon

How to do it?

    1. Fill one container with lukewarm water and the other with cold water (add ice cubes to the container).
    2. Now, blow and stretch the balloon and place it on the mouth of the bottle.
    3. Place the bottle with the balloon in the lukewarm water container and observe for a minute. You’ll see that the balloon begins to inflate with hot air.
    4. Remove the bottle from the lukewarm water container and put it in the cold water container. Observe it for a minute and you’ll see that the balloon begins to deflate and contract to its original state.
    5. Repeat steps 3 and 4 and observe the balloon inflate and deflate.

Science Behind the Experiment

The plastic bottle contains air in the form of gases. Gases expand when they’re warm. The heat acts as the energy that expands the gases and makes it dense. As a result, the balloon inflates. Similarly, gases contract in cold surroundings. The cool air doesn’t have much energy so it contracts the air, making it less dense. Hence, the balloon deflates. Dense gases always float on top of less dense gases. This is how parachutes work. Dense hot air in the parachute balloon makes it float in cooler air.

DIY Experiment: The Sound Wave Experiment

Grade:   9 – 12

Materials needed:

  1. A wooden ruler
  2. Two different size spoons
  3. A four-feet-long woolen string

How to do it?

  1. Create a loop in the middle of the woolen string and insert the spoon in the loop.
  2. Gently pull the loop so that the spoon hangs in the centre and you have equally long strings on either side. Place the spoon such that it hangs just below your waist.
  3. Now, wrap both ends of the string on your index finger and place them near your ears. The set up looks like you’re about to plug them into your ears.
  4. Gently hit the hollow part of the spoon with the ruler (ask your siblings or parents to help you with this). Then, you’ll hear the sound waves.
  5. You can experiment further by hitting the spoon harder to hear it louder.

Science Behind the Experiment

When you hit the spoon with the ruler, it vibrates, creating sound waves. These waves travel up the woolen string all the way to your ears. Here, the woolen sting acts as a conductor (it’s an object that allows sound to pass through it easily). The wool allows for the continuity of the sound waves, which creates reverberation. That’s why, you continue to hear the sound for a little longer after hitting the spoon.

Let us know in comments about your experience in doing these DIYs. Are you curious to know more about these topics? Watch the videos given below to get a better understanding:


About the Author

Charu, a feminist and an accidental writer, is yet to master the art of writing about herself. Always curious to learn new stuff, she ends up spending a lot of time unlearning the incorrect lessons. She enjoys all sorts of stories – real, fictional, new, old, hers and would love hearing yours too. Feel free to ping her at to share anything that you think is worth sharing.

Leave a Comment




October 3, 2020

Thanks for the experiments I enjoy doing them

Aryan Gujarathi

January 12, 2020

Awesome experiments .Thanks for sending these experiments because I love experiments

Satwik Singh

November 8, 2019

Please get some of things in mechanical engineering please

Gulnaaz khaja Khan pathan.

September 5, 2019

Awesome thanks for sharing this experiment with me I had done this after reading.?


August 6, 2019

Awesomeness ?


June 29, 2019

Thanks BYJUS

J.Thiyasthil kumar

June 12, 2019

It’s fabulous, and it’s useful for gaining knowledge
The experiments are to good???


June 12, 2019

It’s very helpful

Aditi panda

June 8, 2019

It was fantastic thanks for the experiment ????????????


June 5, 2019

That was awdome ….just awsome ???


June 2, 2019

I got some more knowledge from this video.Tanks byjus

Jack Sony

June 1, 2019

I test both two experiment. Thanks byju’s for this advice.


May 29, 2019

DIVYANSHI TRIPATHI from Lucknow Uttar Pradesh say the experiment classes 5th.the experiment in fantastic. I am a very interested sub in science experiment. My all lovely teacher .and very intellent.byjus is my favourite.


May 28, 2019

I love the sound waves and was an amazing experiment


May 24, 2019

MY new amazing learning in BYJUs LEARNING APP. I LOVE it.I am Improve my Knowledge from this.I am then new students in BYJUs
now,I am studying sixth stranded. Now, I am topper in my class. Thank you BYJUs. I will study well and i will be the greatest student
in the BYJUs.
I am love it


May 24, 2019

Thank you very much. They are really useful and knowledgeable.

Brijesh khanolkar

May 23, 2019

Thank you guys for sending us these valuable email .

Syed Ibrahim Ahmed

May 23, 2019

Good knowledge about great scientists and about national technology day fantastic thx byjus


May 22, 2019

I like both the experiments I like the second one more

Damanpreet Kaur

May 22, 2019

Thank you Byju’s for this info but could you tell us about the career of an astronomer and the courses. Thank you


May 21, 2019

It was an amazing experience…..


May 20, 2019

Very useful thanks byjus


May 20, 2019

it was really amazing. it worked for me and my family enjoyed seeing it. Thanks byjus

Prachi Arora

May 19, 2019

The experiment for grade 4 to 8 was fun . I did it with my friends and classmates and we all enjoyed.

Armaan khan

May 19, 2019

Amazing experiment.Thanks byjus


May 18, 2019

Thanks for inspiring


May 18, 2019

I tried the experiments and it was just awesome

Aaska keshari

May 18, 2019

Thanks byjus for this interesting experiment

Shavul Hameed

May 17, 2019

Great thanks for this information
I have tried it

Disha Hegde?

May 17, 2019

Thank you byjusfor this great knowledge


May 17, 2019

I tried the both experiment ,it was crazy and amazing ???


May 17, 2019

Super experiment


May 16, 2019

i liked these experiments these really woke up a scientist in me #thankyoubyjus#diyexperiments#scientistinme


May 16, 2019

Beautiful ideas and experiment

Drishti prajapati

May 16, 2019

Great knowledge.

Samrudhi Sonawane

May 15, 2019

I try this experiment at home. It is fantastic and wonderful. Thanks byjus. I am happy to do it ???

Maleeha Sadiq

May 15, 2019

I tried both the experiments they were awesome ????


May 15, 2019

I have done the experiment of classes 4-8 and it was awesome


May 14, 2019

It was a nice experience in doing this.

Tejasvi Ranjan

May 14, 2019

This is amazing ???


May 13, 2019

Thanks for experiment of class 9 to 12

Dibyasha Padhi

May 13, 2019

The project was awesome


May 12, 2019

Good experience. Expecting More.


May 12, 2019

Nice byjus and thanks for your support……

Araman Kumar Parida

May 12, 2019

Thanks for this kind information.

Sharanyo Banerjee

May 12, 2019

I learnt a lot from the video now with this concept I will make half taranga at home

V. Pravalika

May 12, 2019

Happy Mother’s Day and National Technology Day


May 12, 2019

Awesome experiments…….. Love them ??

Athira Krishna A S

May 12, 2019

Thanks Byju’s… ☺️☺️☺️


May 11, 2019

Informative in a understandable logical way

Leon Pius

May 11, 2019

Its cool

Uday Pravin Jirwankar

May 11, 2019

Happy technology day,??

Assassin Phoenix

May 11, 2019

Best learning application available.?


May 11, 2019

Thankyou for the great information ☺️☺️☺️.


May 11, 2019

These DIYs are amazing

Ginny Weasley

May 11, 2019

Thanks for the info Byjus, will surely try. Happy Technology Day to everyone

Shubhajit sarkar

May 11, 2019

I want to be a maths enthusiast like my respected teacher Byju’s Raveendran sir who is a two times CAT TOPPER(? percentiler)
and also a national math Olympiad winner.
Sir if you can see this message then please bless this child rather your student to become successful in reaching his goal a mathematics lover like you.


May 11, 2019

Can I get some more science project
Please mam/sir

Akansha nagae

May 11, 2019

Ma’am actually my mother phone number. Have not balance ma’am you call me

Vivek Adithya

May 11, 2019


Hardik sharma

May 11, 2019

The experiment for classes 4 to 8 is fantastic .. I am in class 7 and i do that experiment and I love it.??????????


May 11, 2019

That was amazing I tested both of the experiment.
Thanks byjus for this great idea and a happy technology day to all.


May 11, 2019

Great knowledge . Thanks byjus


May 11, 2019

I tried it, it was fun thanks byjus


May 11, 2019

The experiment is awesome.
I had done it in my physics lab ………..???it is super fantastic and fabulous


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