Buying Dry Bird Seeds Ltr V Kg

[Antoinette53]

I thought that ltr referred to liquid weight and Kgs was dry weight. I'm now totally confused one seller is selling in a plastic tub weight 5ltrs the other seller is selling in a plastic sack/bag weight 5Kg. Are the same amount/volume or whatever or is 5ltrs more than 5Kg or are they the same weight.

I'd prefer pounds and ounces but I'm old school making me old😁. Any help would be much appreciated and educational. Many thanks

[sandyRoe]

The price would probably tell you how much seed you'd get for your money.

[barry1010]

5 litres weighs 5kg, more or less, there are conditions and variables us mere mortals needn't worry about

[bhg481]

It is legal to sell some goods by volume or weight, so some manufacturers choose one and some the other. Cynics think it's just a legal way of making it difficult for consumers to compare prices.

[bhg481]

barry - I would have expected bird seed to be denser than water so weigh more than a kilo.

[gingejbee]

 5 litres weighs 5 kg...yes, for water and similar density stuff.

Not for bird seed though!

[THECORBYLOON]

Litres can refer to volume as well as a liquid capacity and bags of compost are selt in litre measures, for example.

Seen someone on Anazon asking the weight of a 5l tub of sunflower seeds and someone else said they had just weighed it and it was 2.9kg.

 

 

[THECORBYLOON]

Have you the link to the bird seed in litres?

[gingejbee]

OP...the weight is not 5 litres - that's the volume of the seeds, which would be "weigh more"than 5 kg.

[gingejbee]

@15.52.  Sunflower seeds are lightweight compared with the volume they occupy.

[THECORBYLOON]

What type of bird seed are you wanting?

[Hymie]

A litre is a measure of volume, whereas kilogramme is a measure of mass (weight).

Where a material has unity density, a 1 litre volume will have a mass of 1kg.

 

I’m a bit surprised that the bird seed is sold by the litre because if you were to take a vessel that holds a litre and poured in the bird seed, because of the gaps (between the seeds) the total volume of bird seed would be less than a litre.  In fact if the bird seed had unity density, 1 litre of bird seed would weigh less than 1kg for this reason.

 

In defence of the bird seed manufacturer, there may be a potential issue with the seeds drying out over time, reducing their weight, whereas the change in volume would not be as pronounced.

You will normally see such a disclaimer on bags of compost (that are sold by volume), that may be subject to a slight reduction in volume due to drying.

[Antoinette53]

To all on this thread, thank you, I've got it sorted. Would have replied to each of you individually but couldn't/can't find the so called box at the end of the thread, unless this is that box? Got no idea but thank you one and all

[bhg481]

Selling by volume allows you to vary the seed-mixture and still supply a "tubfull" so can be very convenient.

[New Judge]

"In fact if the bird seed had unity density, 1 litre of bird seed would weigh less than 1kg for this reason."

As indeed it does. The density of bird seed obviously varies, but the average densiy is about 0.6kg per litre. So a five litre sack would weigh about 3kg.

"You will normally see such a disclaimer on bags of compost (that are sold by volume), that may be subject to a slight reduction in volume due to drying."

Eiher that or they may say (for example)  "25 litres when packed".

[THECORBYLOON]

Americans normally use a cup as a dry measure in recipes so that is an amount by volume as opposed to weight.