New Signs is a one stop shop for all of your site signage needs. We also have full ranges of PPE Signs, Warning Signs, Caution Signs, Danger Signs, Mandatory Signs, Security Signs, Speed Limit Signs, Covid-19 Signage and Emergency Information Signs.

The metal container should be capable of some pressure, because the gas will explode inside and you don't want to hurt anyone. Additional you need bucket or bowl filled with water and hydrogen gas.

Here is a neat experiment, but it unfortunately needs a welder to make the equipment, a metal sphere with a volume of about 100 mL. It should have a very small opening on top and a larger one on the bottom. It also needs feet to stand.

First, let me say that I've enjoyed many times exploding soap bubbles of about one milliliter filled with hydrolysis gas. That is 1 cubic centimeter. That will give you a sound that rings in your ears in a decent sized living room. You may wish to use ear protection for the experiment.

However, you start with a stochiometric mixture which is ideal for explosion (after all, that's why you do it, right?), and it is in oxygen, not in air. So even if you "only" have a flammable mixture reaching an ignition source (e.g. electric switch), chances are quite high that as the ignition proceeds through the mixture, it can reach a zone where the gas/air mixture is explosive. Also, because hydrogen is so much lighter than air, it tends to accumulate under the ceiling, so even if there is enough air in the room that an ideal mixture would not be explosive, chances are that there is an explosive layer of gas. (Same with gasoline or, practially more relevant: solvent from glue for parquet floor tiles)

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Some of our state specific signs include our Construction Site Entry Building QLD QBCC Compliant Sign, Construction Site Entry ACT Building Sign and our Construction Owner Builder QLD Sign

Relatedly, if you enter a room and smell natural gas, do not touch that light switch! Either leave immediately or turn off the power to the house and then open windows and such. Why? Because opening the window impacts temperature which could trigger a thermostat to turn on the heating/cooling system (possible spark or flame).

Can’t find the sign you are looking for or after different construction signs? Simply contact us and we can help you find the sign you are looking for or help you create it.

New Signs has a range of site entry signs like the Construction Site Entry Building Sign which has a spot for your company logo ready to go and we can print any of the text fields to give your signs a professional look. This also helps prevent any mistakes while filling in your details by hand and there is no risk of the text smudging or fading to ensure it can be clearly read. Even better, adding your logo and filling in the text fields is included in the price of the sign.

First, close the hole on the top of the container and place it in the bucket under water until it is completely full. Now you can fill the container with hydrogen gas until all water is gone from it. When you remove your container, make sure that the bottom hole stays on the bottom. As Hydrogen is much lighter than air, it will be trapped inside.

Place the container on a stable, nonburnable table/ bench. Have a lighter ready. Now open the top hole and ignite the hydrogen gas. Move away from the experiment. After a while you will hear a phenomenal boom (make sure you have your mouth open). Do not try this in a small room.

I want to electrolyze water to get oxygen and hydrogen. I want to mix them in a regular balloon and ignite it. How much hydrogen would you need in a 2:1 ratio with air for it to be dangerous? Is this generally a safe experiment?

Real world point is, for example, I would NOT recommend recharging your fuel cell car in your garage! Accumulation of odorless and colorless H2 in a room followed by ignition from a spark from flipping on the light switch is a potential disaster for you, the car and the entire house!

The trick behind this is in the ratios. As Hydrogen will burn on top, air will be sucked in at the bottom. As long as the mixture has not the right ratio, it will not explode but just burn at the top. Once enough oxygen has entered it will ignite the whole thing and do a phenomenal bang. The experiment is pretty safe.

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Whether you just want to add your company logo, have your site details printed onto your sign or need to fully customise an entry sign from scratch New Signs has you covered.

The most important point presented above is, in my opinion, the explosive range of hydrogen mixed in air. It is uncommonly and dangerously large!

I was on the back of a flat bed truck with a parade display and a weather ballon on a string about 10 feet above the tray (possibly less was twenty years ago) was accidentally ignited (not by me!) and a few of us were knocked to the floor/truck tray and the closest person had open flesh burns all the way down his arm which was extended in the air towards the weather ballon (may have even been holding a party sized ballon with acetylene as he was lighting them while holding them which is very dangerous and I in no way endorse (he was a lunatic this guy and I had no authority over him)).

Now while the explosive limits of hydrogen in air range from about 18 -- 60 % the flammable limits are from 4 -- 75 %, in oxygen the limit of flammability goes all the way from 4% to 95% read: for practical purposes, hydrogen in oxygen is always at least a flammable mixture. For comparison, gasoline in air is flammable roughly between 1.5 - 7%.

So bottom line start very small with these kinds of experiments and be aware things can and will go wrong so always take as much precaution as you can.

New Signs offers a huge range of construction site signage so you can find the right sign for your project. We have entry signs that incorporate health and safety coordination plans, PPE requirements, warning signs such as construction site do not enter and Covid-19 site safety information.

The regulations to look out for can include minimum sign size, minimum text size and some details such as permit and license numbers can be mandatory to display. Owner builder signs can also differ from those required by building companies.

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Construction Site Entry Signage Requirements differ from state to state and local councils can also require specific information as well. The construction site signage requirements in QLD and Victoria for example will differ so please ensure you look up the specific requirements for your site location. Compliance with local and industry regulations is crucial to ensure the health and safety of everyone on building and construction sites.

Construction Site Entry Signs are signs displayed at the entrance to building and construction sites and provide important information about the site including the project details, contact information, permit and license numbers, emergency contact details and specific rules for entering the site.

Oxygen and acetylene mixed in a ballon will produce a very large explosive bang when lit and a loud noise and gratifying plume of putrid black smoke. Hydrogen and oxygen is going to be many times more explosive, not sure how many times more though.