Submitted by kz21n t3_zzapvz in explainlikeimfive
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Comments
ThenaCykez t1_j2ah4n5 wrote
1.5L of pure water has a mass of 1.5kg. But soda has carbonic acid, sugar or sweeteners, other flavorings, and so on mixed in. Those additives could increase or decrease the density of the liquid.
1.5L of milk would weigh about 1.55kg. 1.5L of unflavored soda water would weigh about 1.48kg.
ScienceIsSexy420 t1_j2al1m6 wrote
I want to expand on this. 1.5L of water weighs 1.5kg by definition. The original definition of the mL was the cubic volume of 1g of pure water at 20°C. So it's is not a coincidence that these numbers are the same, or that the density of pure water is 1.0000, it is so BY DEFINITION.
mjb2012 t1_j2ao3j8 wrote
For the benefit of the OP, slightly more ELI5: “by definition” here means that the people who invented the kilogram intentionally said that a kilogram is whatever 1 litre of distilled water weighs (or rather, its mass) at sea level. Basically. So yes, the weight of the soda bottle in kg must be pretty close to it’s volume in litres, assuming it’s filled with mostly water and assuming you’re on the surface of the earth.
EaddyAcres t1_j2ahrop wrote
One of my teachers used to say a pint is a pound the whole world around. US pints not the UK 20oz
Pocok5 t1_j2ajxdq wrote
> a pint is a pound the whole world around
> US pints not the UK
So that was a fucking lie.
ScienceIsSexy420 t1_j2akj0l wrote
😂
EaddyAcres t1_j2alj92 wrote
Blame the UK, cups-pints-quarts-gallons make sense over here.
greatvaluemeeseeks t1_j2amtgv wrote
Sugar is significantly heaver than water though which would only increase the density of the cola.
Em_Adespoton t1_j2ahe18 wrote
1.5kg of liquid water (which is non compressible) has a mass of 1.5kg (and equivalent weight in newtons at STP).
Coca Cola is water plus syrup (which will be somewhat compressible and potentially less dense) plus carbon dioxide.
If you let the CO2 settle out, you will likely have around 1.3 litres of sugar water left.
lector57 t1_j2aim3d wrote
Short explanation: liter is a measure of volume, the amount of space filled
I Lt of mercury weighs much more than 1 Lt of water even though they occupy same amount of space.
1 lt of water, for example, weighs more than 1 lt of cooking oil.
Conversely... 1 Kg of water occupies LESS space than 1 Kg of cooking oil but 1 Kg of mercury occupies much less space than 1 Kg of water.
ELI5
blissfulGeeky t1_j2aljgb wrote
A liter (L) is a unit of volume, while a kilogram (kg) is a unit of mass. The two units are not directly related to each other, as they measure different quantities.
To convert between liters and kilograms, you need to know the density of the substance you are measuring. Density is the mass of a substance per unit of volume. For example, if you have a liter of water, which has a density of 1 kilogram per liter, the mass of the water is 1 kilogram.
PD_31 t1_j2aqllx wrote
Water has a density of 1kg/L. Since soda is mostly water (with stuff dissolved in it) it will have a similar density, thus your 1.5kg for 1.5L. Some of the ingredients will affect that, particularly the carbon dioxide as it escapes from the solution as a gas, but it should still have a density close to 1.
[deleted] t1_j2agi7i wrote
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ScienceIsSexy420 t1_j2akqbe wrote
True, however can be calculated from volume by using the density of the substance.
Sexc0pter t1_j2agqh5 wrote
The exact composition of the liquid will make a difference, but since softdrinks are mostly water I would imagine that it would be very close to 1.5 kg. The difference might be so slight that your scale can not go to that granular a level. The mass of the bottle will make a difference, as will the slight difference in fill level.