21

General Science / Re: How much water vapour in human breath

« on: 04/12/2022 12:26:06 »

It depands on your heart rate. How much you breathe.

22

General Science / Re: Science Photo of the Week

« on: 04/12/2022 12:23:49 »

MgO(magnesium oxide) nanoflowers with antibacterial properties
Many nanoplates of the magnesium oxide are arranged in a flower kind of a fashion, which increases the surface area of action.

Yasmine Abdallah, Solabomi Olaitan Ogunyemi, Amro Abdelazez, Muchen Zhang, Xianxian Hong, Ezzeldin Ibrahim, Afsana Hossain, Hatem Fouad, Bin Li, Jianping Chen, "The Green Synthesis of MgO Nano-Flowers Using Rosmarinus officinalis L. (Rosemary) and the Antibacterial Activities against Xanthomonas oryzae pv. oryzae", BioMed Research International, vol. 2019, Article ID 5620989, 8 pages, 2019. https://doi.org/10.1155/2019/5620989

23

Chemistry / Re: How to make Ferric Ammonium Citrate??

« on: 01/12/2022 07:57:04 »

Ferric ammonium citrate is used I think in the preparation of nutrient media, as a iron source. It is a complex salt.
We mix the three salts Ferric hydroxide for iron, citric acid, and ammonium hydroxide for ammonium ion. You can read https://www.law.cornell.edu/cfr/text/21/184.1296#:~:text=(a)%20Ferric%20ammonium%20citrate%20(,stoichiometry%20of%20the%20initial%20reactants. for more details.

24

Chemistry / Re: how many sides does a hexagon have

« on: 01/12/2022 07:51:54 »

Not sure if it is a spam or a simple question.

Answer is 6.

25

Chemistry / Re: Where can I find magnesium metal scrap at home?

« on: 09/07/2021 11:16:33 »

It is difficult to get magnesium in pure form at home. Mostly it will be available in alloy form in some metallic structure like car or laptops.
The magnesium in most of the supplements and antacids are present in salt form.
Some type of firecrackers contain magnesium. You can find out the composition if you have any firecracker.

26

General Science / Re: What is a black hole?

« on: 25/06/2021 09:58:24 »

To understand it simply you can say it is an area where everything including light is pulled into it. You can image it as a giant vacuum cleaner. https://en.wikipedia.org/wiki/Black_hole

27

Just Chat! / Re: Electric car efficiency.

« on: 04/06/2021 12:12:10 »

Fast charging
Best mileage
Low Cost
no noise

28

The Environment / Re: Why is Global Warming a threat?

« on: 04/06/2021 12:08:45 »

The human population continues to rise most rapidly in flood-prone, low-lying coastal zones at the same time as sea levels are increasing.

29

Famous Scientists, Doctors and Inventors / Re: Who is the father of physics?

« on: 04/06/2021 12:03:20 »

None other than Issac Newton.

30

Physics, Astronomy & Cosmology / Re: Is everything in the universe in motion?

« on: 04/06/2021 12:01:30 »

Yes, each and everything in-universe is in motion. Due to Special Relativity, all things are in motion in relation to one another, and none of them have superior frames of reference.

31

General Science / Re: Is Washing Dishes with Cold Water as Effective as Using Hot Water?

« on: 04/06/2021 11:57:04 »

No, washing dishes with cold water is not effective as hot water.

32

Technology / Re: Is there a device to freeze my drink asap?

« on: 03/06/2021 12:31:15 »

Yes, there is device Chill Bits.

33

General Science / Re: Is this the future?

« on: 03/06/2021 12:22:09 »

Despite the future is bright for robotics but to operate robots engineers must be needed.

34

Physics, Astronomy & Cosmology / Re: What is a singularity?

« on: 03/06/2021 11:40:52 »

singularity definition can be as:
a point in space where the quantities used to quantify the gravitational field become infinite in a way that is independent of the coordinate system.

35

Physics, Astronomy & Cosmology / What are the effects of force?

« on: 03/06/2021 11:36:19 »

What are the effects of force?

36

General Science / Re: Why can I see the moon during the day?

« on: 02/06/2021 12:14:46 »

Primarily, there are two reasons why we sometimes see the moon during the day. First of all, the moon is bright and close enough to be seen against the blue hue of the sky. Secondly, the duration for which it is above the horizon of Earth coincides with the sun, making it possible to be seen during the daytime.

37

Question of the Week / Re: QotW - 21.03.02 - Difference between rechargeable and normal batteries?

« on: 02/06/2021 12:13:26 »

Rechargeable batteries usually cost more than regular batteries.

38

General Science / Re: Binary star: What color is the sky on a planet?

« on: 02/06/2021 12:09:05 »

The most common color for the sky on Earth is a white (or rather grey) sky. Clouds cover around 70% of the Earth, and nature by which they are scattering shortwave radiation makes them appear white or grey.

39

Physics, Astronomy & Cosmology / Re: Are black holes really holes?

« on: 02/06/2021 12:07:45 »

I think that.
No, a black hole is not really a hole at all. A black hole is an object just like any other, except that it is extremely dense. This gives it such a high gravitational field that nothing, not even light, can escape. Because no light escapes a black hole, it is invisible – or ‘black’ – although they can be detected by their effect on the material around them. The term ‘hole’ was used because whatever falls ‘into’ a black hole is trapped forever.

40

General Science / Re: What is a black hole?

« on: 02/06/2021 12:05:08 »

Black holes are one of the weirdest phenomena in the World. A black hole is a space-time area where gravity is so strong that nothing can escape. Light is sucked into it, thus the term 'black hole.' Since no light can get out of black holes, they're invisible. A space telescope with special equipment is needed to locate a black hole.  It's a massive amount of stuff crammed into a minimal place.