problem with transition.scale for square that falls

Getting Started Newbie Questions
#1

I actually like this:
if the square tomb and some Yscale value I make an animation where it breaks “animationBris”

but the problem is that the value Yscale is not interpreted accurately corona and animation may be different each time.

local square = display.newRect( 100, 100, 100, 100 ) &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; transition.scaleBy( square, {tag = "squareTransition", xScale =-1, yScale =-1, time=1000, alpha = 0.1 } ) &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; local function onEveryFrame( event ) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; print(square.yScale) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if square.yScale \<= 0.1 then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; square:setFillColor(1,0,0) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; transition.cancel("squareTransition") &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if square.yScale ~= 0.1 then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; animationBris() &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; end &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; end&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; end