Picture posting is enabled for all :)
I did not bother to paint them black. The first night they were filled with warm water but after that I found they warmed up quite well during the day. In general the coldest nights are on sunny days.
Why is it that dark bottles give off their heat quicker? I have never heard of this.
QuoteWhy is it that dark bottles give off their heat quicker? I have never heard of this.It's basic physics, the same reason that car radiators are painted black (to lose heat) and solar panels are black (to absorb heat) - you can try it in the kitchen with a couple of different coloured mugs and some hot water - assuming similarly shaped mugs of similar material and equal quantities of water, the contents of the darker mug will cool down quicker than the water in the light coloured one 8)
dark bottles are good because they absorb more heat, but we need a cover
So does that mean that you have to tend to them everyday to move the protection. And surely some days will not be warm enough during the daytime
If I use milk bottles I can put a ring round through the handles to prevent them falling over. Though coke bottles are taller.
Adding anti-freeze to the water too?