Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


Weight of beans vs concrete

Reply to topic
Bike Chat Forums Index -> Dear Auntie BCF...
View previous topic : View next topic  
Author Message

mic
Brolly Dolly



Joined: 09 Sep 2010
Karma :

PostPosted: 21:24 - 13 Mar 2013    Post subject: Weight of beans vs concrete Reply with quote

Hi

Long boring story short..... A fridge pack of heinz beans says 1kg on the label. If I eat the beans and pour some ready mix concrete in the empty tub, how much will it weigh?! How am I suppose to work it out without doing it?!

Cheers ta!
____________________
zzr600
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Derivative
World Chat Champion



Joined: 03 Aug 2010
Karma :

PostPosted: 21:28 - 13 Mar 2013    Post subject: Reply with quote

You need to know the density of concrete, and the volume of the container.

The tub has a specific volume.
An easy way to measure the volume would be to fill it with water and weigh it. 1 kg of water = 1 litre (0.001 m^3) to a reasonable approximation.

Once you have that volume, you multiply it by the density of concrete.

Wikipedia tells me:

https://en.wikipedia.org/wiki/Properties_of_concrete

'The density of concrete varies, but is around 2,400 kg/m³'
Or 2.4kg per litre.

Put that way, a 2L bottle of coke would hold 4.8kg of concrete.

Thinking about it - it might be reasonable to assume beans are about as dense as water. A tin of beans weighs about 400g and it's about the same volume as a 330ml can of coke.


Last edited by Derivative on 21:30 - 13 Mar 2013; edited 1 time in total
 Back to top
View user's profile Send private message You must be logged in to rate posts

Islander
World Chat Champion



Joined: 05 Aug 2012
Karma :

PostPosted: 21:30 - 13 Mar 2013    Post subject: Reply with quote

Concrete weighs 2400kg/m3. Work out the volume of the tub, do some division. Thumbs Up
 Back to top
View user's profile Send private message You must be logged in to rate posts

carvell
Scuttler



Joined: 05 Sep 2003
Karma :

PostPosted: 21:31 - 13 Mar 2013    Post subject: Reply with quote

You need to know the density of both, https://www.aqua-calc.com/page/density-table will help you.

Work out the volume of beans that equates to 1kg, then work out how much the same volume in concrete weighs.

[edit] beaten...
____________________
Yamaha TDM 850
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Tristan.
World Chat Champion



Joined: 26 May 2007
Karma :

PostPosted: 21:33 - 13 Mar 2013    Post subject: Reply with quote

volume of a 410g tin of beans is apparently 0.043m^3 (you could work it out by measuring it to check) so that gives a relative density (assuming ~50g for the tin) of 0.84. The relative density of concrete is ~2.4. No point being precise given the amount of assumptions. Concrete is about 3 times as dense as beans, so it would weigh 3kg.
 Back to top
View user's profile Send private message You must be logged in to rate posts

mic
Brolly Dolly



Joined: 09 Sep 2010
Karma :

PostPosted: 21:36 - 13 Mar 2013    Post subject: Reply with quote

This is all good but am I correct to base it on 1kg of beans and not 1kg of water, or is it 1kg volume regardless of what's in it?
____________________
zzr600
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Derivative
World Chat Champion



Joined: 03 Aug 2010
Karma :

PostPosted: 21:41 - 13 Mar 2013    Post subject: Reply with quote

mic wrote:
This is all good but am I correct to base it on 1kg of beans and not 1kg of water, or is it 1kg volume regardless of what's in it?


A kilogram is a unit of mass (we use it for weight as well, sort of).
Volume is measured in litres or metres cubed (m^3).

Volume refers to the size of the object. Balloons for example are very voluminous but pretty light.

1kg refers to the mass of the beans, nothing to do with the container. The container is the size that happens to fit 1kg of beans (it'd fit a gram of air, or a few kilograms of gold, for example).

I used water earlier because water is pretty similar to beans in terms of density. Get a can of beans and a can of coke (basically water). They're not exactly the same, but within 25% on both mass and volume.


Last edited by Derivative on 21:45 - 13 Mar 2013; edited 1 time in total
 Back to top
View user's profile Send private message You must be logged in to rate posts

mic
Brolly Dolly



Joined: 09 Sep 2010
Karma :

PostPosted: 21:44 - 13 Mar 2013    Post subject: Reply with quote

Cool, sounds like it might just do the trick then Very Happy will try it friday and see what happens

Cheers people Thumbs Up
____________________
zzr600
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Flatbadger
World Chat Champion



Joined: 07 Apr 2012
Karma :

PostPosted: 23:33 - 13 Mar 2013    Post subject: Reply with quote

What's the density of beans? Brilliant! Laughing

Ground anchor? Or is someone going to be sleeping with the fishes?
____________________
If you can keep your head when all about you
Are losing theirs and blaming it on you,
You're in ISIS
 Back to top
View user's profile Send private message You must be logged in to rate posts

mic
Brolly Dolly



Joined: 09 Sep 2010
Karma :

PostPosted: 04:51 - 14 Mar 2013    Post subject: Reply with quote

Flatbadger wrote:
What's the density of beans? Brilliant! Laughing

Ground anchor? Or is someone going to be sleeping with the fishes?


Who da man! Yeah it's for a little boat I'm picking up soon.
____________________
zzr600
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts
Old Thread Alert!

The last post was made 12 years, 323 days ago. Instead of replying here, would creating a new thread be more useful?
  Display posts from previous:   
This page may contain affiliate links, which means we may earn a small commission if a visitor clicks through and makes a purchase. By clicking on an affiliate link, you accept that third-party cookies will be set.

Post new topic   Reply to topic    Bike Chat Forums Index -> Dear Auntie BCF... All times are GMT
Page 1 of 1

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Read the Terms of Use! - Powered by phpBB © phpBB Group
 

Debug Mode: ON - Server: birks (www) - Page Generation Time: 0.09 Sec - Server Load: 0.37 - MySQL Queries: 14 - Page Size: 63.74 Kb