Calculating Heat Loss through 1m Glass Pane - 15oC Difference

[luigihs]

Determine the heat loss through a 1m square pane of 6 mm thick glass for a temperature difference of 15oC.
Thermal conductivity of glass is k = 0.72 W m^-1 K^-1
Solution
Rate of loss of heat = 0.72W m^-1 K^-1 x 1 m^2 x 15oC/(6x10^-3 m ) <--- Ok so I understand everything but I don't understand where my teacher gets 6x10^-3 ?? is not in the question that number.

Please help me

 

[gneill]

Determine the heat loss through a 1m square pane of 6 mm thick glass for a temperature difference of 15oC.
Thermal conductivity of glass is k = 0.72 W m^-1 K^-1
Solution
Rate of loss of heat = 0.72W m^-1 K^-1 x 1 m^2 x 15oC/(6x10^-3 m ) <--- Ok so I understand everything but I don't understand where my teacher gets 6x10^-3 ?? is not in the question that number.

Please help me

What is 6mm in meters?

 

[luigihs]

What is 6mm in meters?

Cheers! I'm so stupid