incomplete vertical lines

Question

I have a problem with tabularx: the vertical lines don't go all the way to the bottom: I'm guessing it's due to adding a math equation in the 1st cell.
How can I do to have complete lines?
documentclass{article}

usepackage[T1]{fontenc}
usepackage[utf8]{inputenc} 
usepackage[french]{babel}
usepackage[left=1.5cm, right=1.5cm, top=1.5cm, bottom=1.5cm]{geometry}
usepackage{tabularx}

begin{tabularx}{linewidth}{|c||*{7}{>{centering arraybackslash}X|}}hline
    volume d'eau (L)& 0.3 & 0.5 & 0.7 & 0.9 & 1.1 & 1.3 & 1.5  
    hline
    force (N) & 3 & 5 & 7 & 9 & 11 & 13 & 15   
    hline 
    Résistance ($textrm{k}Omega$) &  &  &  &  & & & &  
    hline
    end{tabularx}
end{document}

Thanks for your help

Bernard · Accepted Answer

There was a spurious & in the last line. I also suggest a slightly different layout, where the double vertical line  interrupts the inner horizontal lines, which can be obtained with hhline, some vertical padding at the top of cells with extrarowheight, and a simpler way to typeset kΩ with siunitx.
documentclass{article}

usepackage[T1]{fontenc}
usepackage[french]{babel}
usepackage[margin=1.5cm]{geometry}
 usepackage{tabularx}
 usepackage{hhline}
usepackage{siunitx}

begin{document}

setlength{extrarowheight}{2pt}
noindentbegin{tabularx}{linewidth}{|c||*{7}{>{centering arraybackslash}X|}}
    hline
    volume d'eau (L)& 0.3 & 0.5 & 0.7 & 0.9 & 1.1 & 1.3 & 1.5 
    hline
    force (N) & 3 & 5 & 7 & 9 & 11 & 13 & 15 
    hline
    Résistance (si{kohm}) & & & & & & & 
    hline
    end{tabularx}
vskip 1cm

noindentbegin{tabularx}{linewidth}{|c||*{7}{>{centering arraybackslash}X|}}
    hline
    volume d'eau (L)& 0.3 & 0.5 & 0.7 & 0.9 & 1.1 & 1.3 & 1.5 
    hhline{-||-------}
    force (N) & 3 & 5 & 7 & 9 & 11 & 13 & 15 
    hhline{-||-------}
    Résistance (si{kohm}) & & & & & & & 
    hline
    end{tabularx}

end{document}

leandriis · Answer

If I add the missing begin{document} and try to compile your code, I end up with an error message such as
Extra alignment tab has been changed to cr.

which tells us that there is an extra & somewhere in your table.
As soon as you get an error message, do not look at the resulting .pdf document.
Even if you get something that on first glance resembles a pdf file, there can still be issues with it. After an error, TeX only tries to recover enough to syntax check more of the file, it does not try to make sensible output after an error.
To get rid of the error message, delete the last & from the "Résistance" row and you will end up with a compilable example resulting in the following output. Such an extra &can be spotted more easily if you align all &s in your code, just as I did in the below MWE.

Additionally, I recommend using the siunitx package for the units, as shown in the following example code:
documentclass{article}

usepackage[T1]{fontenc}
usepackage[utf8]{inputenc} 
usepackage[french]{babel}
usepackage[left=1.5cm, right=1.5cm, top=1.5cm, bottom=1.5cm]{geometry}
usepackage{tabularx}

usepackage{siunitx}

begin{document}
begin{tabularx}{linewidth}{|c||*{7}{>{centering arraybackslash}X|}}hline
    volume d'eau (si{liter})  & 0.3 & 0.5 & 0.7 & 0.9 & 1.1 & 1.3 & 1.5  
    hline
    force (si{newton})        & 3   & 5   & 7   & 9   & 11  & 13  & 15   
    hline 
    Résistance (si{kiloohm}) &     &     &     &     &     &     &     
    hline
    end{tabularx}
end{document}

incomplete vertical lines

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