Wort boiling temps

[Sean_Mc]

Bit of a niggle really with last weekends brew and my equipment.

Usually in the past I hit 104c before getting a boil and that's usually where it stays for the 60/90min, just that my last brew was more 105/106c. I still live at 440meters above sea level, so could it be a slightly stronger/sugary wort causing the slight increase in temp?

As I said just a minor curiosity, wondering if my temp probe is off

 

[31bb3]

Not sure if atmospheric pressure has an affect on the boil temps

 

[Sean_Mc]

Can only measure it against my next brewday I guess :party:

 

[SloeBrewer]

Not sure if atmospheric pressure has an affect on the boil temps

It does. Boiling point is raised below sea level, and lowered above sea level. Sugar will also raise both the freezing and boiling points.

 

[evanvine]

Not sure if atmospheric pressure has an affect on the boil temps

Yes it does Eddy, it's all down vapour pressure.
Pure water will boil at 100C when the atmospheric pressure is 1000mB.
Increase the pressure and you increase the boil temp and vice versa.
Also increase the gravity of the liquid and you will increase the boil temp.
The boil temp however cannot increase ( taking into account the above) no matter how much heat you throw at it (in an open vessel) because of the latent heat of vaporisation.
Boil temp can be increased by increasing pressure, as in a pressure cooker.
Trivia:- Water at 250psi will boil at appros 450 degs (Steam loco boiler)!

 

[Kinleycat]

Bit of a niggle really with last weekends brew and my equipment.

Usually in the past I hit 104c before getting a boil and that's usually where it stays for the 60/90min, just that my last brew was more 105/106c. I still live at 440meters above sea level, so could it be a slightly stronger/sugary wort causing the slight increase in temp?

As I said just a minor curiosity, wondering if my temp probe is off

Roughly speaking your thermometer is out by 4-5 decrees c.
Buy a new one or compensate by this amount.
Most hand held probes are fairly innacurate, we use and bin them regularly at work if they are out by that much (plus or minus) :thumb: .