Weird behaviour from graphicx - inserting PDF files

Question

So I created some graphs in Excel, saved them as PDFs and used the following code to import them to LaTeX:

\newpage
\begin{figure}[htbp]
\centering 
\includegraphics[width=0.95\textwidth]{white1.pdf}
\caption{This figure shows the commulative oxygen production rate of white light in iteration number 1. The SEM bars show reading error from the pipette. }

\end{figure}

\newpage
\begin{figure}[htbp]
\centering 
\includegraphics[width=0.95\textwidth]{green2.pdf}
\caption{This figure shows the commulative oxygen production rate of green light in iteration number 2. The SEM bars show reading error from the pipette. }

\end{figure}
\newpage
\begin{figure}[htbp]
\centering 
\includegraphics[width=0.95\textwidth]{white3.pdf}
\caption{This figure shows the commulative oxygen production rate of green light in iteration number 3. The SEM bars show reading error from the pipette. }

\end{figure}


\newpage
\begin{figure}[htbp]
\centering 
\includegraphics[width=0.95\textwidth]{green4.pdf}
\caption{This figure shows the commulative oxygen production rate of green light in iteration number 4. The SEM bars show reading error from the pipette. In this figure there is overlapping of SEM bars that show no significance difference }

\end{figure}

\newpage
\section{Discussion}

However the problem is that the new page at the very end (discussion) is not in order. It gets injected after the first figure.

So if the pages were numbered like this:

fig1, fig2, fig3, fig4, dis1 

everytime I try to create the dis1 page by \newpage I get the following output:

fig1, dis1, fig2, fig3, fig4

Anyone know what's happening?

Answer 1

Use \clearpage instead of \newpage. It will process all floats before creating a new page.

Answer 2

This typically happens with floats that have a contents larger than the text block dimensions. Presumably, in your case, green2.pdf (the first "offender") is flushed to a page of floats and subsequently pushed until there is nothing left to typeset before it is finally printed. Use @Herbert's suggestion to flush (or process) any pending floats, or modify the size of the imported graphic so it will fit within the text block.

Note that a width of 0.9\textwidth will fit the image within the text block width, but it - together with the caption - could still be larger than the text block height (\textheight).