latex change line spacing in short text block or caption

e.g. to increase line spacing: \linespread{1.3}\selectfont{}

(specify a ratio in argument of \linespread{X.XXX}) 

Src:  http://tex.stackexchange.com/questions/113626/changing-spacing-of-caption

revtex and algorithm error

Floating environments created with the float package (as algorithm is) are incompatible with the revtex4-1 class.
The only way you have to include such an environment in your document, is to use the floating specifier H, which avoids the environment to float.
MWE:

\documentclass[aip, amsmath, amssymb, reprint]{revtex4-1}

\usepackage{graphicx}
\usepackage{dcolumn}
\usepackage{bm}
%\usepackage{float} % loaded by algorithm
\usepackage{algorithm}
\usepackage{algpseudocode}

\usepackage{lipsum} % just for dummy text

\begin{document}

\lipsum[1]

\begin{algorithm}[H]
  \caption{Hello}
  \label{EPSA}
   \begin{algorithmic}[1]
   \State $T_m= \min\limits_k (T_c(k)),  k_m= \arg\min\limits_k (T_c(k))$
   \end{algorithmic}
\end{algorithm}

\lipsum[1]

\end{document} 

Src:  http://tex.stackexchange.com/questions/231191/algorithm-in-revtex4-1